Cassian doesn't have any siblings, but there's a connection through the Rebellion that can feel siblinglike. He hasn't really experienced it since he was younger, because his work keeps him working on the edges and alone except for Kay. His relationship with Kay doesn't completely fit into a sibling model, they're just them.
Charles has Raven his adopted sibling in the movieverse. I know in other comicverses, he I think sometimes has a sister. His relationship with Raven is one of my favorite parts of X-Men: First Class because it shows both of their strengths and weaknesses. They both want to know they're not alone, but Charles thinks he knows what's best for everyone which gets in the way of his helping. While Raven is used to being on her own, so she's not as open with Charles as she could be, because she doesn't expect him to get it.
Quentin has a spoiler sibling but that he hasn't seen since he began his fosterage. I hope we get to encounter them at some point. I currently have the newest Toby Daye book in my library book pile but haven't been in the right headspace to read it yet. They're always such intense books and reading the synopsis, it looks like its going to be an emotional ride. So I'm holding off on it for the moment.
Sameth has his older sister Ellimere and they have a tricky relationship because their lives have been defined so much by their roles in the Old Kingdom. They were closer when they were younger and there's a sense they might get better as canon moves on.
William has a younger brother Mark who's been sick most of his life. Most of what their family has done has been for Mark's sake; moving west and his father taking Ben Wade to Yuma. Thanks to Milliways, Mark is healthy and going to school. The two boys are fairly close in age, canon never says how near but in my mind its around two years.
For Will S., when I first created his backstory, I overdid it and had him have lots of siblings who died. I do like the idea of him being the only one living but would probably go with three now. Since there's a clear sense of him taking care of him and that extending out to Nottingham.
Moist is an only child.
Ivan is also an only child, his father died on the day he was born and at the point he's at in canon, his mother hasn't remarried. Though he basically has siblings through his close family; Gregor, Miles and Elena with all sorts of complexity.
Demeter has many siblings and not great relationships with all of them. Her arguments with her siblings aren't the messiest of Greek mythology, but they're pretty awful. After everything happened with Persephone and Hades, she moved to France since she didn't want to live in Greece anymore. Space has helped with some interactions but her family is messy.
Creed has this annoying little half brother kicking around. They try to kill each other.
Rose is an only child who wishes she had a big sister to lean on.
Kylo is an only child and grateful for it.
Tess has three half brothers: Lex (alive), Julian x2 (both deceased), and Lucas (alive). She has only ever met Lex and it was wonderful at first. And then came the betrayal. She tried to kill him, he sort of killed her and now it's a complicated mess. Ah, Luthors.
Enzo had one sibling, Dot, his much-older sister-cum-mother-figure. Then he was accidentally restored from backup, and now he has two siblings, Dot and himself. His relationship with Dot has always been excellent; his relationship with himself at first can be pretty well summarized by the following: ...although they got over himselves and it has improved considerably since then.
Unless canon or the comic books ever contradict it, Zecora has four siblings. (Based on her own name's origins, all their names mean "zebra" in different African languages, but I haven't decided which ones.)
Amascut has siblings; most of the Kharidian pantheon are her siblings. The only two that are not are her parents. Four of her siblings, Het, Scabaras, Crondis, and Apmeken, she considers lower beings and mere pets of her father. In a way they are, since her father ascended them to godhood without her mother's help and they are much less powerful than Amascut and Icthlarin, her almost twin brother? They are still annoying enough to interfere with her plans. As for Icthlarin himself, she hates his guts. I am surprised she didn't develop huge abandonment issues because of his dumb ass. He means well, but he has serious guilt issues and wants desperately to be the goodest boy.
(Icthlarin is a dog/jackal Anubis stand-in and Amascut, of course, is a cat/lioness hybrid Sehkmet/Ammit stand-in, if you are missing context. I would say that they fight like cats and dogs, but Icthlarin actually protects cats from Amascut and her followers when he can, the stupid smelly cur.)
(Icthlarin is actually the goodest boy and deserves all the headpets and bellyrubs.)
I haven't yet decided if the Zanarian Fairies are just one big sisterhood and how much that would matter anyway. I suspect it doesn't matter much to Fairy Fixit herself either way. She does have a strong resemblance to the Tooth Fairy General as well as the same fashion sense, so there is that.
George has no siblings, but just before he died, he and Simon declared themselves brothers, someone you love completely but had no choice over having in your life. (And George doesn't know this yet, but Simon took the Lovelace name when he Ascended. Simon is the best friend George has ever had, and the person he was closest to.
Eowyn has one brother, Eomer, and they have been extremely close since their mother died. Eowyn loves him dearly and looks to him as a pillar of strength, especially while Theoden is under Wormtongue's influence. She also considers Theodred, her cousin, to be as close as a brother.
Alec has one sister, Isabelle, one biological brother, Max, and one adopted brother/parabatai, Jace. He loves them all fiercely and would do literally anything to protect them both. Jace is his closest friend, closer than a brother, the other half of his soul. Isabelle keeps him from taking everything too seriously, and she also calls him on his bullshit when he shuts himself off from people. Max...Alec wishes they were closer. When Max was born, Alec's parents were having a hard time, and his mom sort of checked out, so Alec took on the role of secondary dad to Max, and he was always the serious, rule-following brother, while Izzy and Jace were the fun, reckless ones. He's really looking forward to Max being old enough to go hunting with them.
Anders has three brothers: Mikkel, Tyrone, and Axl. He loves them, but he is not always the best at showing him. Currently he's out of the family's good graces for having slept with Mike's fiance at their engagement party, which he maintains he did to keep Mike from marrying someone who wasn't good for him. (Mike married her anyway.) He's inherently selfish, but he does actually want to keep his family safe.
Orpheus had one brother, Linus. They were not that close as children. Linus was always their father's favorite, while Orpheus chafed against the responsibilities of princedom. He misses Linus now, though his memories of his brother are fading, and sometimes he forgets about Linus.
Aradia's species doesn't really work that way. Troll couples contribute genetic material to an enormous communal slurry, and even identifying a biological parent and child is nearly impossible, although trolls with the same sign probably share upwards of 50% of their DNA and are regarded as ancestors and descendants. The exception is identical twins, which I assume happen when two wigglers hatch from one egg; Hiveswap has a pair of twins but they haven't actually done anything yet.
Bastion could arguably be considered a sibling of all the other Bastion units made in the German omnium, and/or of Torbjörn's kids (Brigitte being the most plot-relevant Lindholm child). I'm being somewhat facetious when I say that, although I do enjoy half-jokingly calling them Brigitte's sibling whenever I get the opportunity.
Thurlow has an older brother and a younger sister!
This is one of the places where Wilford's canon gets accidentally weird. Depending on which parts one considers canon, and whether one takes Word of God as canon, he has two, one, or no siblings.
I've ignored most of the game canon except for the first brother, Walter. Terribly inconsistent of me, but Walter was so fricking weird I couldn't just ignore him. He has a farm in central Los Santos, where he grows and obsesses over watermelons. He and Wilford haven't spoken in over a decade.
In the miniseries last year, it was supposed to be revealed that Wilford and the character Mark are brothers. The commentary track talked about how this was supposed to be part of Wilford's huge, disgusting betrayal, but endless rewrites swallowed up all of that dialogue. Except for one line which got missed, where Wilford shouts that he won't be bullied "in [his] own home." I could have easily run with that, and even considered it, but it didn't work with the narrative I'd already established and when I finally figured out how to use the entire thing (as it had retconned everything) going with Mark being a third brother made even less sense with what I'd established and how I'd managed to work in the new stuff. So I went with the idea that since it was cut from what was presented in the final product, it's not canon, and Mark is just a new friend.
Cecil has a sister, Abby. He loves his sister, even though their relationship is a bit strained. She quit school to take care of him when their mother died, and he deeply disapproves of her husband.
Cecil also has a brother, Cal. He has never told Cal that he is gay - he is pretty sure it wouldn't go well.
Abby only has one brother.
Cecil, if asked, would say in all honesty, that he only has a sister.
Yamato has a younger brother, Takeru Takaishi, who's about three years younger than him and the bearer of the Crest of Hope.
They get along well, and the two of them adore each other, but especially in 01 it's a sibling relationship that's characterised by awkwardness: When 01 starts, their parents' divorce and mid-to-late 90s Japan's general attitude that two sides of a divorced family shouldn't interact means that they've only seen each other once a year for about four years, and Yamato is simultaneously bitter about that, deeply insecure about whether or not he's a good brother, and somewhat blind to what Takeru's actually like -- with his base assumption being that since Takeru was raised by their one good parent, and Yamato by their well-meaning but grossly negligent one, Takeru must be spoiled and fragile.
(And that last is only compounded by the fact that Takeru tends to play up being vulnerable as a defense mechanism, the same way that Yamato plays up being gruff and aggressive.)
A big part of his mixed feelings on Taichi, the only other older brother in the Chosen, for a lot of 01 is that he convinces himself that Takeru would prefer to have the relatively more emotionally open Taichi as a brother, even though neither of them suggest that the thought's even crossed their minds, and the entire Potential Brother Theft Strife exists nigh-on exclusively in Yamato's head.
By Tri, Yamato and Takeru have a slightly less awkward sibling relationship, helped in part by the fact that Takeru's moved to Odaiba and they can now arrange to see each other on their own time. It's telling, though, that Takeru takes several opportunities to playfully tell Yamato that he's his 'favourite person,' just to make entirely sure Yam's abandonment issues don't flare up again.
Related: Yamato has a habit of just extending his general older-brother-yness to people around him, irregardless of age. Koushiro, Jyou, Mimi, Daisuke, and to a lesser extent Miyako and Ken all get hit by this in canon to a degree.
Ellen doesn't have any so far as she knows, but after her father's spectacular failures of judgment regarding keeping information from her, she's privately half-convinced that Dad actually had a family on the surface somewhere before meeting Mom and just thought it was one more thing she didn't need to know.
Enjolras has no siblings. (He's one of the very few Amis with any canonical family details, handily.) I'm sure as a kid he periodically wondered what a sibling would be like or wished he had one, but it was never a burning desire or anything.
Cosette also has no siblings -- there was a very brief time when she was very small when it seemed like she might have a couple of foster sisters! But then that was conclusively answered no, because the Thénardier parents are the worst. So whatever kind of relationship she and Éponine (and Azelma) have or could have, siblings is not it. Anyway, I'm sure she occasionally thought it would be fun, but mostly didn't think a lot about it.
Thor, on the other hand, uh. He has one brother! Hi, Loki! Their relationship is... I'm gonna go with "close but contentious," or possibly just "it's complicated."
Kazul has no canonical info on this -- and very little canonical info on whether dragons even care about sibling relationships -- but I'm going to say that she probably has a couple, but they're significantly older.
And for Doctor Dinosaur, geez, let's hope not. (He shows no indication of thinking he does, at any rate, so I'm going to say whether or not there are other delusional paleontologically inaccurate velociraptors running around his world, he doesn't know about them nor think of them as siblings.)
Jim canonical has one brother, but I've given him two because original canon has him with probably two, unless one of them was just Conan Doyle forgetting his characters again, and mixing names up etc. Either way, it's a safe bet that Moftiss might use at least one of them, seeing as they made a specific point of mentioning a brother when they really didn't have to.
Anyway - Millicanon says one of said brothers is dead (which may or not be true), and the other...Jim has plans for once Sherlock knows he's not dead anymore. :D
Ahsoka - Has about 10k not!Siblings and extended family, at least that's the estimated number of Jedi from Dave Filoni or Pablo Hidalgo at teh time of the Clone Wars. She also has the clones of the 501st. In theory, she has family back on her home world, but canon never mentions them and family ties were broken when she went to the Jedi.
Sabine - Has a younger brother who she is pretty competitive with. When they reunite, they seem pretty friendly with each other and I got the feeling not being able to talk to him really was hard on Sabine.
Sam - Head canon says he has a younger cousin and no brothers or sisters. I don't have anything to base this on.
Hank - Canon is vague and I'm pretty sure comics canon has him as an only child.
Danny - Only child, and an orphan to boot. He does have Ward and Joy, who he grew up with and he considers them family. He also has Davos who is his brother in K'un Lun that he bonded with during his time there. Things are not good with any of them at the moment, in fact Joy drigged Danny and then she and Ward have him committed (I will get to the OOM someday) and Davos is currently...spoiler white text: hunting Danny down to drag him back to K'un Lun, though we don't know that yet.
Viv: She had a twin brother and they seemed to have gotten along. He died and she's still messed up enough by it that she's turned off her emotional processors. While he was alive they didn't seem to have any rivalries or anything, and seemed friendly and as close as developing artificial teens could be.
Tybalt: He has at least a sister who I think is still alive. My head and heart say she is Queen of Cats in London and I hope canon doesn't prove me wrong. She was once the world to him and still means a lot.
Hera had a brother. She almost never talks about him, because canon threw this in at the last moment and I think without much thought to it and so I had to make a bunch of stuff up to make it work his death was a life-defining trauma for her.
Kanan doesn't have any siblings that he knows of. I'm still not entirely sure how the Jedi worked exactly when a Force-sensitive-enough child was brought to the Temple. I took Kanan saying he'd never known his parents as meaning that they'd died when he was too young to remember them, but it might also mean the Jedi separated him from them and he just wasn't permitted to know them. Which... seems cruel. But then they also apparently wouldn't let Anakin go save his mother from slavery, so. Kanan might have some kind of family out there somewhere, but if that is the case, he wouldn't have sought them out, anyway, as he'd know he'd only be putting them in danger. But my inclination is that he doesn't think he has any immediate living family.
That being said, though they're often characterized as the "parents" (which, I mean, we're not helping with), neither Hera nor Kanan are really much older than their "children." Of course Zeb is older than they are, but at the start of the series Kanan is 28 and Hera is 24, so they're really closer to "older sibling" age to Sabine and Ezra than they are to a parent age. And I think with one or the other of them, they are more older-sibling-y, it's together that they become Space Parents.
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Charles has Raven his adopted sibling in the movieverse. I know in other comicverses, he I think sometimes has a sister. His relationship with Raven is one of my favorite parts of X-Men: First Class because it shows both of their strengths and weaknesses. They both want to know they're not alone, but Charles thinks he knows what's best for everyone which gets in the way of his helping. While Raven is used to being on her own, so she's not as open with Charles as she could be, because she doesn't expect him to get it.
Quentin has a spoiler sibling but that he hasn't seen since he began his fosterage. I hope we get to encounter them at some point. I currently have the newest Toby Daye book in my library book pile but haven't been in the right headspace to read it yet. They're always such intense books and reading the synopsis, it looks like its going to be an emotional ride. So I'm holding off on it for the moment.
Sameth has his older sister Ellimere and they have a tricky relationship because their lives have been defined so much by their roles in the Old Kingdom. They were closer when they were younger and there's a sense they might get better as canon moves on.
William has a younger brother Mark who's been sick most of his life. Most of what their family has done has been for Mark's sake; moving west and his father taking Ben Wade to Yuma. Thanks to Milliways, Mark is healthy and going to school. The two boys are fairly close in age, canon never says how near but in my mind its around two years.
For Will S., when I first created his backstory, I overdid it and had him have lots of siblings who died. I do like the idea of him being the only one living but would probably go with three now. Since there's a clear sense of him taking care of him and that extending out to Nottingham.
Moist is an only child.
Ivan is also an only child, his father died on the day he was born and at the point he's at in canon, his mother hasn't remarried. Though he basically has siblings through his close family; Gregor, Miles and Elena with all sorts of complexity.
Demeter has many siblings and not great relationships with all of them. Her arguments with her siblings aren't the messiest of Greek mythology, but they're pretty awful. After everything happened with Persephone and Hades, she moved to France since she didn't want to live in Greece anymore. Space has helped with some interactions but her family is messy.
Tumnus is an only child.
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Rose is an only child who wishes she had a big sister to lean on.
Kylo is an only child and grateful for it.
Tess has three half brothers: Lex (alive), Julian x2 (both deceased), and Lucas (alive). She has only ever met Lex and it was wonderful at first. And then came the betrayal. She tried to kill him, he sort of killed her and now it's a complicated mess. Ah, Luthors.
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...although they got over himselves and it has improved considerably since then.
Unless canon or the comic books ever contradict it, Zecora has four siblings. (Based on her own name's origins, all their names mean "zebra" in different African languages, but I haven't decided which ones.)
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(Icthlarin is a dog/jackal Anubis stand-in and Amascut, of course, is a cat/lioness hybrid Sehkmet/Ammit stand-in, if you are missing context. I would say that they fight like cats and dogs, but Icthlarin actually protects cats from Amascut and her followers when he can, the stupid smelly cur.)
(Icthlarin is actually the goodest boy and deserves all the headpets and bellyrubs.)
I haven't yet decided if the Zanarian Fairies are just one big sisterhood and how much that would matter anyway. I suspect it doesn't matter much to Fairy Fixit herself either way. She does have a strong resemblance to the Tooth Fairy General as well as the same fashion sense, so there is that.
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Eowyn has one brother, Eomer, and they have been extremely close since their mother died. Eowyn loves him dearly and looks to him as a pillar of strength, especially while Theoden is under Wormtongue's influence. She also considers Theodred, her cousin, to be as close as a brother.
Alec has one sister, Isabelle, one biological brother, Max, and one adopted brother/parabatai, Jace. He loves them all fiercely and would do literally anything to protect them both. Jace is his closest friend, closer than a brother, the other half of his soul. Isabelle keeps him from taking everything too seriously, and she also calls him on his bullshit when he shuts himself off from people. Max...Alec wishes they were closer. When Max was born, Alec's parents were having a hard time, and his mom sort of checked out, so Alec took on the role of secondary dad to Max, and he was always the serious, rule-following brother, while Izzy and Jace were the fun, reckless ones. He's really looking forward to Max being old enough to go hunting with them.
Anders has three brothers: Mikkel, Tyrone, and Axl. He loves them, but he is not always the best at showing him. Currently he's out of the family's good graces for having slept with Mike's fiance at their engagement party, which he maintains he did to keep Mike from marrying someone who wasn't good for him. (Mike married her anyway.) He's inherently selfish, but he does actually want to keep his family safe.
Orpheus had one brother, Linus. They were not that close as children. Linus was always their father's favorite, while Orpheus chafed against the responsibilities of princedom. He misses Linus now, though his memories of his brother are fading, and sometimes he forgets about Linus.
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Bastion could arguably be considered a sibling of all the other Bastion units made in the German omnium, and/or of Torbjörn's kids (Brigitte being the most plot-relevant Lindholm child). I'm being somewhat facetious when I say that, although I do enjoy half-jokingly calling them Brigitte's sibling whenever I get the opportunity.
Thurlow has an older brother and a younger sister!
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I've ignored most of the game canon except for the first brother, Walter. Terribly inconsistent of me, but Walter was so fricking weird I couldn't just ignore him. He has a farm in central Los Santos, where he grows and obsesses over watermelons. He and Wilford haven't spoken in over a decade.
In the miniseries last year, it was supposed to be revealed that Wilford and the character Mark are brothers. The commentary track talked about how this was supposed to be part of Wilford's huge, disgusting betrayal, but endless rewrites swallowed up all of that dialogue. Except for one line which got missed, where Wilford shouts that he won't be bullied "in [his] own home." I could have easily run with that, and even considered it, but it didn't work with the narrative I'd already established and when I finally figured out how to use the entire thing (as it had retconned everything) going with Mark being a third brother made even less sense with what I'd established and how I'd managed to work in the new stuff. So I went with the idea that since it was cut from what was presented in the final product, it's not canon, and Mark is just a new friend.
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Cecil also has a brother, Cal. He has never told Cal that he is gay - he is pretty sure it wouldn't go well.
Abby only has one brother.
Cecil, if asked, would say in all honesty, that he only has a sister.
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They get along well, and the two of them adore each other, but especially in 01 it's a sibling relationship that's characterised by awkwardness: When 01 starts, their parents' divorce and mid-to-late 90s Japan's general attitude that two sides of a divorced family shouldn't interact means that they've only seen each other once a year for about four years, and Yamato is simultaneously bitter about that, deeply insecure about whether or not he's a good brother, and somewhat blind to what Takeru's actually like -- with his base assumption being that since Takeru was raised by their one good parent, and Yamato by their well-meaning but grossly negligent one, Takeru must be spoiled and fragile.
(And that last is only compounded by the fact that Takeru tends to play up being vulnerable as a defense mechanism, the same way that Yamato plays up being gruff and aggressive.)
A big part of his mixed feelings on Taichi, the only other older brother in the Chosen, for a lot of 01 is that he convinces himself that Takeru would prefer to have the relatively more emotionally open Taichi as a brother, even though neither of them suggest that the thought's even crossed their minds, and the entire Potential Brother Theft Strife exists nigh-on exclusively in Yamato's head.
By Tri, Yamato and Takeru have a slightly less awkward sibling relationship, helped in part by the fact that Takeru's moved to Odaiba and they can now arrange to see each other on their own time. It's telling, though, that Takeru takes several opportunities to playfully tell Yamato that he's his 'favourite person,' just to make entirely sure Yam's abandonment issues don't flare up again.
Related: Yamato has a habit of just extending his general older-brother-yness to people around him, irregardless of age. Koushiro, Jyou, Mimi, Daisuke, and to a lesser extent Miyako and Ken all get hit by this in canon to a degree.
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I have yet to decide whether or not this is true.
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Cosette also has no siblings -- there was a very brief time when she was very small when it seemed like she might have a couple of foster sisters! But then that was conclusively answered no, because the Thénardier parents are the worst. So whatever kind of relationship she and Éponine (and Azelma) have or could have, siblings is not it. Anyway, I'm sure she occasionally thought it would be fun, but mostly didn't think a lot about it.
Thor, on the other hand, uh. He has one brother! Hi, Loki! Their relationship is... I'm gonna go with "close but contentious," or possibly just "it's complicated."
Kazul has no canonical info on this -- and very little canonical info on whether dragons even care about sibling relationships -- but I'm going to say that she probably has a couple, but they're significantly older.
And for Doctor Dinosaur, geez, let's hope not. (He shows no indication of thinking he does, at any rate, so I'm going to say whether or not there are other delusional paleontologically inaccurate velociraptors running around his world, he doesn't know about them nor think of them as siblings.)
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Anyway - Millicanon says one of said brothers is dead (which may or not be true), and the other...Jim has plans for once Sherlock knows he's not dead anymore. :D
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Sabine - Has a younger brother who she is pretty competitive with. When they reunite, they seem pretty friendly with each other and I got the feeling not being able to talk to him really was hard on Sabine.
Sam - Head canon says he has a younger cousin and no brothers or sisters. I don't have anything to base this on.
Hank - Canon is vague and I'm pretty sure comics canon has him as an only child.
Danny - Only child, and an orphan to boot. He does have Ward and Joy, who he grew up with and he considers them family. He also has Davos who is his brother in K'un Lun that he bonded with during his time there. Things are not good with any of them at the moment, in fact Joy drigged Danny and then she and Ward have him committed (I will get to the OOM someday) and Davos is currently...spoiler white text: hunting Danny down to drag him back to K'un Lun, though we don't know that yet.
Viv: She had a twin brother and they seemed to have gotten along. He died and she's still messed up enough by it that she's turned off her emotional processors. While he was alive they didn't seem to have any rivalries or anything, and seemed friendly and as close as developing artificial teens could be.
Tybalt: He has at least a sister who I think is still alive. My head and heart say she is Queen of Cats in London and I hope canon doesn't prove me wrong. She was once the world to him and still means a lot.
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canon threw this in at the last moment and I think without much thought to it and so I had to make a bunch of stuff up to make it workhis death was a life-defining trauma for her.Kanan doesn't have any siblings that he knows of. I'm still not entirely sure how the Jedi worked exactly when a Force-sensitive-enough child was brought to the Temple. I took Kanan saying he'd never known his parents as meaning that they'd died when he was too young to remember them, but it might also mean the Jedi separated him from them and he just wasn't permitted to know them. Which... seems cruel. But then they also apparently wouldn't let Anakin go save his mother from slavery, so. Kanan might have some kind of family out there somewhere, but if that is the case, he wouldn't have sought them out, anyway, as he'd know he'd only be putting them in danger. But my inclination is that he doesn't think he has any immediate living family.
That being said, though they're often characterized as the "parents" (which, I mean, we're not helping with), neither Hera nor Kanan are really much older than their "children." Of course Zeb is older than they are, but at the start of the series Kanan is 28 and Hera is 24, so they're really closer to "older sibling" age to Sabine and Ezra than they are to a parent age. And I think with one or the other of them, they are more older-sibling-y, it's together that they become Space Parents.