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Siblings tend to be relatively close in age. But there's a wide period where someone can become a parent, which can result in upwards of decades of difference in age. One sibling may be in diapers when the other is already at university, or even has children of their own. They're practically in different generations despite being from the same generation. This could lead to Big Brother Instinct, and for a slightly shorter age gap, Annoying Younger Sibling.

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More often this is because they're half-siblings, with the younger sibling being the result of a May–December Romance on their shared father's part. Or they're full-blooded siblings, but one was born early into their parent's relationship (likely a Teen Pregnancy) and the latter in their late 30s/40s, maybe even 50s with an Absurdly Elderly Mother. Or long after having their first kid, the parents chose to adopt.

Because of the large age gap, the siblings are likely to have an estranged relationship. If they're close, the older sibling may be more of a Parental Substitute or uncle/aunt in their behavior, rather than a regular sibling interaction. This can also lead to an uncle/aunt around the same age or even younger than their nephew/niece, who if close might share a sibling or cousin-like bond. Maybe they'll make jokes about the situation.

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Sometimes there is also a Plot Twist where it turns out the older sibling was really the parent and had the younger “sibling” at a young age.

If one of the parents is immortal, this is almost guaranteed, though the age difference might be so huge the older sibling died long before the younger was even born. Producing these is semi-expected for kings and general nobility, as it ensures there's no lack of an heir. It was also common before reliable birth control as people often married young and were expected to have a lot of kids (partly because of high child mortality rates). Likely to contribute to a Tangled Family Tree or get older siblings asked Is That Cute Kid Yours?. Contrast Absurdly Youthful Mother, where two different generations are a lot closer to each other than is expected, and Family Relationship Switcheroo, where someone pretends their child is a much younger sibling.

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To qualify for this trope, there must be at least a decade between the youngest and oldest sibling.


Examples:

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    Anime & Manga 
  • Code Geass has the Britannian Royal Family. With an official 108 consorts for Charles zi Britannia, there are plenty of half-siblings and even full-blooded siblings with years if not decades sized age gaps. For example, Second Princess Cornelia is 27 while her younger sister Third Princess Euphemia is 16. Schneizel, the Second Prince of Britannia, is almost in his thirties, while his half-brother Lelouch is 17. Extra materials reveal that Clovis (24) has a younger full-blooded sister who is fourteen years old. The only ones with a reasonable age gap are Lelouch and Nunnally, born three years apart, something that is likely because their mother Marianne was the favoured consort to Charles.
  • In Fruits Basket, ten years separates Yuki from Ayame. This mean that while Yuki was a kid, Ayame was an Aloof Big Brother who wanted nothing to do with him, leaving Yuki permanently disillusioned towards him. Ayame came to regret this deeply, and by the time the manga starts, has become the exact opposite, an extremely clingy and flamboyantly affectionate brother who Yuki is often annoyed by.
  • Fullmetal Alchemist:
    • As an ageless Truly Single Parent, Father's homunculi children in the manga vary in age by decades, the largest gap being Pride at 350+ and Wrath in his 60s(or if you don't count him due to being formerly human, Gluttony at 160+). In a bizarre way, Father (or rather the body he inhabits) is a much-older half-brother to Ed and Alphonse Elric, being a clone of sorts of their father that was created about 400 years before them.
    • The 2003 anime reveals Envy is actually the homunculus of Ed and Al's half-brother, born over 300 years before them.
    • We also see Denny Brosh, who is a young adult man serving in the military, living at home with his younger brother and sister, who are both implied to be under the age of twelve. No parents are seen, which may imply that Denny is raising his siblings.
  • JoJo's Bizarre Adventure
  • Lyrical Nanoha:
    • There is a 27 year gap between Fate and her "older sister" Alica who she was cloned from. To put it in perspective, had Alicia not died as a child she would be the same age as Fate's adoptive mother Lindy.
    • Nanoha is 8 years younger than her older sister Miyuki and 10 years younger than her older brother Kyouya. She notes in the very first episode of the franchise that it makes her feel like something of a third wheel in her own household.
  • One Piece: Big Mom has been marrying and dumping men since her teens, and has managed to have dozens of children well into her fifties. As a result, some of the Charlotte family differ in age by decades, even with adult half-siblings. The biggest age difference is Charlotte Prospero, who's 50, and Charlotte Anana, who's eight.
  • Ren and his older sister in Sazanami Cherry have a several year age gap. This age gap allows his sister to keep secret the fact she's transgender because Ren can't remember her as anything but an older sister.
  • In Ano Ko ni Kiss to Shirayuri wo, Aika (18 years old) is so much younger than her sister that she's actually much closer in age to that sister's daughter Haine (15 years old). As a result, Aika and Haine behave more like sisters than aunt and niece (amongst other things…)
  • Shirogane and his little sister Kei in Kaguya-sama: Love Is War are a little less than three years apart in canon. However, the recurring Kindergarten A.U. in the Official Doujinshi spinoff has him as a recently started teacher and her young enough that she hasn't even started school yet (meaning that they're around 20 years apart).

    Comic Books 
  • Wonder Woman: Wonder Girl Cassie Sandsmark is several thousand years younger than her half-siblings like Hercules, Ares and Athena whom her father Zeus fathered in antiquity. Like in Classical Mythology, it's a consequence of Zeus being both immortal and never keeping it in his pants. In the New 52, Wonder Woman herself has this role due to Zeus being her father, with Cassie becoming the daughter of one of his demi-gods instead.
  • This comes up quite frequently with Wolverine's offspring, thanks to his Healing Factor, and he's had numerous other children over the decades. Most notably, Daken was born in the 1940s, putting him in his 70s. His sister-by-cloning, X-23 is 20. Her sister-by-cloning Gabby is physically 13, but is Younger Than They Look because she was rapid-aged to that point.

    Fan Works 
  • The Hey Arnold oneshot The Argument depicts Helga as an unplanned pregnancy because there's a twelve year age gap between her and her sister Olga. Her parents decided to keep her, but they still neglected Helga while favoring her sister.
  • Subverted in Child of the Storm: Alison Carter is presented as Peggy Carter's much younger sister, however she was actually Peggy's daughter - apparently she would have been passed off as her niece, but Peggy's only sibling died before Peggy entered the war. The trope was invoked to avoid people targeting her for the Super Serum in her blood, and the stigma of the era. Aside from an incident with the Red Room in 1953, it worked for over six decades.
  • In Discworld fan writings by A.A. Pessimal, Assassin Johanna Smith-Rhodes is the eldest of five siblings. She left Rimwards Howondaland for Ankh-Morpork at the age of nineteen. One of the things she left behind was her youngest sibling, who at the time wasn't even two years old. Scroll forward by nine years and Johanna is established as an Assassin and a teacher at the Guild school: the latest batch of eleven year old new pupils arrives and one is an overseas student from Howondaland: her youngest sibling Mariella. The two sisters spend time together outside School, and Johanna realises that with a seventeen year age difference, their relationship is not straightforward siblinghood - it has overtones of mother - daughter.
  • A popular Pokémon theory is that Ash's barely-mentioned father is Professor Oak. In canon, Professor Oak is his rival Gary's grandfather, which would make Gary Ash's nephew despite being the same age as him.
    • In Mended, Delia enterered a relationship with Oak and became pregnant with Ash shortly after Oak was widowed. Ash's niece May is older than him.
  • In the Jojos Bizarre Adventure Alternate Universe Fic Joestar Family Groupchat Shenanigans, Jonathan and Dio, the oldest Joestar children, are both 35, while the youngest, Josuke, is 15, which is around the same age as Dio's children.
  • Dangerverse: Although technically Hermione Granger's elder sister, Gertrude "Danger" Granger is effectively one of her mothers after their blood parents' deaths.
  • Kingdom Hearts 3: Final Stand: Glacies, the elder child of Terra and Aqua, is 18 come the sequel Kingdom Hearts 4: New Light, while her younger brother Ignis is a toddler.
  • In Princess Trixie Sparkle, Celestia has kept a huge secret from her younger sister Luna for over a millenia: they have an older sister named Astelle. Astelle was a teenager/young adult prior to Luna's birth and had already ran away. When it turned out Astelle had become evil and vengeful, Celestia decided to keep her a secret from Luna.
  • Resident Evil: A Brother's Promise: William "BJ" Birkin, the elder sister of Sherry Birkin, is ten years older than her.
  • Son of the Sannin: Among Jiraya and Tsunade's four children, there is a rather large gap between their eldest daughter Shizune and the rest of their children (sixteen between her and Naruto and an additional three for Hagane and Kaida). In fact, Naruto, Hagane, and Kaida are actually closer in age to Shizune's infant children than they are to her.
  • In the Steven Universe human Alternate Universe fanfic Too Soon, Winona's twins Yvonne and Beatrix are seventeen years old when their younger sister Piper is born.
  • Mother Diamond: By the time Pink Diamond takes her form, her older sisters are already ruling over their own planets.
  • In The Secret, Emma and her younger brother Billy have a gap of seventeen years between them (at the start of the fic she's twenty-one and he's just four). As a result, Emma ends up acting as a parental figure to Billy at times especially after their mother dies, eventually becoming his legal guardian. To further emphasize this, Billy is still a young child when he becomes an uncle to Emma's newborn son.
  • One Day at a Time: Bruce Wayne's four biological children, due to both being half-siblings and the younger two biologically engineered, having been born years after Bruce's death. Damian Wayne, the eldest of the four, is fifteen years older than his sister Helena, twenty-five years older than his younger brother Terry, and thirty-one years older than his youngest brother Matthew. Thus, despite legally being siblings of the first generation Wayne Family, the three are officially considered members of the second generation with their nieces Carrie Kelley and Penelope Todd, with the former six years older than Helena. The fact that they were raised by the Promoted to Parent Jason Todd, the second eldest of Bruce's original five children, only hammers it in.
  • In Chemistry, Twilight Sparkle is roughly thirteen years younger than her brother Shining Armor. This is due to an incident where Cadance's love magic accidentally led to several pregnancies.

    Films — Animation 
  • In Barbie as Rapunzel, Prince Stefan appears to be about twenty years old, while his brother and three sisters are all about three.
  • The Land Before Time: In movie VI: The Secret of Saurus Rock we learn that Cera (who, despite her Vague Age, is still a child) is an aunt to two threehorn hatchlings named Dana and Dinah, thus proving that she has at least 1 older sibling who is already at an age that he/she can have children. This sibling is not seen however.
  • Lilo & Stitch: Lilo is five going on six, while her older sister Nani is nineteen, and Nani has been Promoted to Parent since their parents died. As such, she acts much more like a mother than an older sister towards Lilo. In fact, the original version of the scene in which the sisters bond after their fight had to be replaced because test audiences mistook Nani for Lilo's mom instead of her big sister. The revised scene makes it more clear that they are sisters.
  • In The Princess and the Frog, Prince Naveen, a young adult, has a six and a half-year-old brother. This is revealed as the punchline for Charlotte jokingly suggesting she could Settle for Sibling.

    Films — Live-Action 
  • In The Bachelor and the Bobby-Soxer, Myrna Loy is the older sister to Shirley Temple, despite a 22-year age gap. The reason for that decision is probably because they're in a Love Triangle with Cary Grant and having a mother and daughter in a triangle would be too much Squick.
  • In Stand by Me and the original novella that inspired it, Gordie and his late older brother Denny are separated by a ten-year age gap. Their relationship is portrayed as distant in the book (the age gap renders Denny "just a guy"), but in the movie Denny is painted as having been a kindly older brother who encouraged Gordie's writing. Gordie's parents (noted in the narrative as old enough to be his grandparents) have ignored him since Denny's death.
  • In You've Got Mail, Tom Hanks's character Joe has a 4-year-old half-brother. He also has an 11-year-old aunt, his grandfather's daughter with a younger woman.
  • The tendency of the prequel X-Men films to set each film a decade apart leads to this with the Summers brothers. Havok is older and is a teenager in X-Men: First Class in the 60s, while Cyclops is a similar age when introduced in X-Men: Apocalypse in the 80s.
  • In Sorcerers, Ivan (In-Universe age unspecified, the actor being twenty-nine at the time) has a little sister Nina (age unspecified, the actress being nine). At first she seems like an Annoying Younger Sibling, insisting she'll accompany him for his romantic evening with his fiancee and later sneaking after him when he goes to the said fiancee's rescue. However, she is very quick-thinking, while her brother is badly affected by Love Makes You Stupid, and she ends up helping him a lot.
  • Super Mario Bros.: Mario is middle-aged, whereas Luigi is in his early 20s; in fact, it's stated early in the film that Mario was the one who raised Luigi. This is a contrast to the games, in which they're fraternal twins.

    Literature 
  • In The Camp Half-Blood Series, Percy's mother remarries by the end of the events of the second series and soon gives birth to his younger half-sister, Estelle, who is 17 years younger than him. He has to take off from adventuring to help his mom and step-dad take care of her and catch up on all of the high-school classes he missed.
    • Naturally, since his father is the immortal Greek God Poseidon, Percy has many half-siblings. Most of these half-siblings are thousands of years older than him, and the majority of his demigod siblings, like Theseus, died many years before he was even born.
  • In one chapter of Fazil Iskander's Sandro of Chegem, a mule brought to the funeral of the local Dirty Old Man (one who went Out with a Bang at that) notes how ridiculous it is that the deceased one's son from his latest wife is being watched by the man's granddaughter who is thrice his age.
  • A Song of Ice and Fire:
    • Walder Frey is a peevish old man who keeps getting new young wives, with no plan of stopping even in his nineties. As a result he has children from his later marriages younger than great-grandchildren from his early marriages. There's enough of an age difference that his great-grandson "Black" Walder Frey, who has a habit of sleeping with his relatives' wives, is rumored to be the real father of the children Walder had with his seventh wife.
    • Aerys II Targaryen had Prince Rhaegar as a teenager, and his youngest daughter Daenerys was born shortly after his death. This is because Queen Rhaella experienced a series of stillbirths and miscarriages after giving birth to Rhaegar, with only her last two children Viserys and Daenerys surviving to adulthood. Rhaegar already had children at this point, meaning if Rhaenys and Aegon survived the sack of King's Landing they'd be older than their aunt Dany. Or Aegon is older than her, if he really is Aegon VI Targaryen and not an impostor.
    • Aegon IV "The Unworthy" Targaryen was made to marry his sister Naerys as a teenager, but Really Gets Around into his forties. His heir (unless you believe certain rumors) Daeron and youngest bastard Shiera Seastar are at least over 20 years different in age, and some of his Great Bastards are in the same age group as Daeron's older sons.
  • Several examples from Warrior Cats; justified given that the characters are cats, who don't actually go through menopause and can have kits at any point in their lives, in addition to having much shorter childhoods compared to their overall lifespan than humans have. There's Leopardfoot and Patchpelt with their siblings Redtail, Willowpelt and Spottedleaf, who are all younger than Leopardfoot's son and are still fairly young warriors when Patchpelt had retired to be an elder, and then there is the gap between the first and second litters of Sorreltail and Brackenfur's kits and especially Cloudtail and Brightheart's kits (Whitewing was already a fairly senior warrior when full-grown children of her own by the time her siblings were born). Yellowfang and her siblings are an especially extreme example - Yellowfang already has an adult child and is considered elderly when her siblings are born. Even siblings with a "normal" age gap but not in the same litter often have adult siblings when they are born, due to, as mentioned above, being cats.
  • Inverted in the Brother Cadfael series, in which young Edwin Gurney and Edwy Bellecote are uncle and nephew respectively, yet look and behave just like brothers.
  • In The Red Tent, some of Tabea's half-siblings have children of their own. There is also another one on the way.
  • A Brother's Price: The setting makes up for the rarity of men via a form of Exotic Extended Marriage in which a man marries all the sisters of a family. This can easily result in women who are old enough to get married while their youngest sisters are still children, or even yet to be born.
  • The Sisterhood of the Traveling Pants: Tibby's younger siblings Nicky and Katherine are thirteen and fourteen years younger than her.
  • In Dune:
    • Glossu Rabban was over 60 while his brother Feyd-Rautha was 19, the prequels establish that the Bene Gesserit slipped their parents fertility drugs to ensure Feyd's birth for their Super Breeding Program.
    • Less extreme example with Paul Atreides and his 16-years younger sister Alia.
  • In the The Princess Diaries series, Mia is a high school student when her mother gives birth to her little half-brother Rocky.

    Live-Action TV 
  • Doctor Who: Hinted at; while the Doctor is never seen having any children on-screen, by the First Doctor's introduction he already had a grandchild in Susan Foreman, and the Tenth Doctor does confirm to Rose in one episode that "I was a dad once." He ends up being a Truly Single Parent as the Tenth Doctor, multiple centuries and lifetimes later, with Jenny in "The Doctor's Daughter." Even by Time Lord standards, the gap between the two would be enormous.
  • This seems to be a case with the some of the members of the Dingle family in Emmerdale. Although the ages of Zak's children are not mentioned or developed, his daughter Belle (who was born in 1998) has six half-siblings that were mostly adults when they arrived on the show before or after she appeared. Cain, for example, continues to look a whole generation older than her when she was a teenager (there's even a 27 year age difference between Belle and Cain's actors).
  • Game of Thrones: Jon Snow is the secret child of Rhaegar Targaryen, Daenerys Targaryen's famed brother. Jon Snow and Daenerys are about the same age, despite being nephew and aunt.
  • Jane the Virgin: The title character is in her late twenties with a child of her own when her father Rogelio fathers his second daughter Baby.
  • Malcolm in the Middle: Francis is out of the house and married when Lois finds out she's pregnant with Jamie. Reese and Malcolm have graduated from high school and are out of the house and in college in the finale, when Lois finds out she's pregnant again.
  • Modern Family: Jay's stepson Manny is over twenty years younger than his biological kids Claire and Mitchell and younger than even Claire's kids. Claire and Mitchell are in their thirties by the time Jay and Manny's mother Gloria have Joe, who's even younger than Mitch's daughter. Joe himself is just six years old when he becomes a great-uncle to Hayley and Dylan's twins.
  • Shameless (US): Fiona and Liam seem to be about twenty years apart, and she acts as a Parental Substitute to him.
  • Double Subverted during the last season of The Nanny. When the season starts, Maxwell Sheffield, with his two older children Maggie and Brighton almost in their 20s and his youngest Gracie already becoming a teenager, has since married Fran Fine following years of Belligerent Sexual Tension. Fran finds out that she's pregnant, and is heartbroken when Maxwell tells her that he doesn't want any more children. It's made worse when she learns that she isn't really pregnant - the test provided a false positive. Later that season, Fran gets pregnant for real and Maxwell has since changed his mind about having additional children; the show ends with Fran having fraternal twins.
  • Season One of Peaky Blinders has four of the five Shelby siblings as adults, who run the family betting shop (and street gang). Youngest sibling Finn is barely eleven in the first season, thirteen in the second, and it isn't until season four at approximately fifteen or sixteen that he becomes a full Blinder. In the prior seasons, he's ordered around by the rest of his family and serves as a Butt-Monkey for Arthur and John to mock.
  • On Designing Women, Julia Sugarbaker is twelve years older than her "baby sister" Suzanne, and multiple episodes indicate that Julia helped to raise Suzanne. One episode reveals that they also have a half-brother (from a relationship their father had when their parents were separated) who is roughly halfway between them in age.
  • In season 2 of The Waltons, Olivia gets pregnant. She loses the baby because she's too old to carry properly; had the child (posthumously named Joy) survived, she would have been 18 years younger than her oldest sibling John-Boy.
  • On Gilmore Girls, Rory's half-sister Gigi, from her father's marriage, is born when she is a senior in high school.
  • In Once Upon a Time thanks to interdimensional time passage and the Curse erasing her parents' memories, Emma's younger brother is at least ten years younger than her own son.
  • In Anne with an E, this applies to Mary's children. She had Elijah when she was very young and had Delphine years later after marrying Bash. Elijah was already a young adult by the time Delphine was born.
  • In Orphan Black, Charlotte is roughly 20 years younger than all of her sisters. She calls Kira her cousin, although she's technically her niece.
  • On Blackish, DeVante is born as his eldest sister Zoey is heading off to college; actually, all of his siblings are about a decade or so older than him.
  • On 7th Heaven, the twins Sam and David are born during their eldest brother Matt's first year of college. Mom Annie actually revealed her pregnancy to dad Eric at Matt's high school graduation.
  • Beverly Hills, 90210: Erin Silver is born the summer before her elder half-siblings Kelly and David's senior year at West Beverly (when Kelly is around 17 and David is around 16). When Erin herself starts going to West Beverly in the sequel series, Kelly's a guidance counselor there.
  • In the later seasons of Roseanne, Dan's father Ed has a May–December Romance with Roseanne's best friend Crystal, and they get married. Their son, Ed Junior, has this with both of his older half-brothers; Crystal's son Lonnie is a teenager, and Dan is in his forties. One episode even has Dan's daughters, both of whom are older than Lonnie, babysitting the teething infant Ed.
  • Deanna Troi's mother Lwaxana got pregnant during the fourth season of Star Trek: Deep Space Nine, ultimately giving birth to a son who was about 35 years younger than Deanna.
  • Boy Meets World: Cory's younger brother Josh is born when Cory is in his first year of college and elder brother Eric is in his twenties. In the Sequel Series Girl Meets World, Josh is only three years older than Cory's daughter Riley and becomes a love interest for her best friend Maya.

    Myths & Religion 
  • Classical Mythology: While the age difference isn't discussed much because non-creation myths don't typically have clear timelines, the gods' Immortality and, in most, cases promiscuity, would lead to half-siblings centuries in age different at least, especially when it comes to Zeus's divine children and his innumerable demigod offspring.

    Theatre 
  • Westeros: An American Musical: There is evidence towards a large age gap between Rhaegar and his younger sister Daenerys. Elia Martell and her children, who were canonically Rhaegar's wife and children, were killed seventeen year prior to the beginning of the play. Daenerys, meanwhile, has only recently gotten married when the play starts.

    Video Games 
  • Dragon Age has a few examples:
    • In Dragon Age: Origins, if Loghain is recruited to be a Grey Warden near the end of the game and is selected to do the Dark Ritual, his child by Morrigan is thirty years younger than his daughter Anora.
    • Gaspard and Florianne de Chalons, cousins of Empress Celene who are first encountered in Dragon Age: Inquisition, are brother and sister. Supplemental material reveals that Gaspard is thirteen years older than Florianne, and has doted on her since she was a little girl.
  • God of War: Kratos once had a daughter called Calliope before being tricked into Offing the Offspring by Ares. Centuries later, in the era of Norse Mythology, he's raising a son called Atreus. Kratos himself would also likely be an example, given that his father is Zeus, who's been siring gods and demigods for thousands of years.
  • In The Elder Scrolls series, this is common for children among the Long-Lived species of Mer (Elves). Mer age similarly to the races of Men until early adulthood, at which point their aging slows considerably. While subject to an Immortal Procreation Clause which limits the overall number of a children a Mer woman can have (with few having more than three), they apparently remain fertile for hundreds of years. A prominent example is Barenziah, Queen and later Queen Mother of Morrowind and Wayrest. As a teenager, she had an affair with Emperor Tiber Septim, which resulted in a pregnancy. Since a child with a Dunmeri mistress would be incredibly inconvenient to Septim and his nascent empire, he ordered his healer to magically abort the child. Barenziah would later marry Septim's Dunmeri general, Symmachus, and have two children with him - Helseth (King of Morrowind during the eponymous game and Morgiah - some 350 years after conceiving with Septim. Around 20 years later, she would also birth an illegitimate child with a mysterious figure known as the "Nightingale", later revealed to be Drayven Indoril; the child was Dralsi Indoril, mother of Karliah from Skyrim.
  • In Skies of Arcadia, crew member Polly's husband Robinson has been missing for twenty years, with Polly raising their daughter Anne alone for all that time. If Robinson is recruited, his entry in the "Where Are They Now?" Epilogue notes that he and Polly go on to have ten more children, all of whom are obviously much younger than their sister Anne.
  • This is revealed to be the case in Hero Of The Kingdom II, when the hero learns that the pirate captain Black Rose is his own long-lost older brother. The brother, whose real name is not given, left home at the age of 12 to earn money to support the family; the hero at that time was only three. Their younger sister had not yet been born, so this trope is in play for her and the oldest brother, who is at least a dozen years older than she is.
  • Implied in Mass Effect. Liara T'soni begins the series at the age of 106, "barely more than a child" by asari standards. Liara's father, another asari, also states that she had at least one other daughter prior to her relationship with Liara's mother. Since Liara's parents were together for more than a century, and Liara was born after her parents had broken up, this means that when Liara was born, her half-sister was at least as old as Liara is during the series. Given their shared parent's advanced age, it's likely the difference is even greater than that.

    Web Comics 
  • Sabrina of Sabrina Online is an adult with a job. Her younger sister Tabitha is five years old.
  • Extreme case in The Cyantian Chronicles: Elite wolves live for centuries, but after a civil war among the second generation the first generation refrained from having more cubs for over 400 years, only changing their minds when their age started to catch up with them. Syrys wakes up from two centuries in stasis to find he has two half-brothers with their own cubs, while Rama's half-sister Sheana is a few months younger than his bastard son Vin.

    Western Animation 
  • Family Guy:
  • King of the Hill: Hank Hill's father Cotton Hill ends up remarrying a woman about the same age as him, resulting in an infant son, "Good" Hank Hill. At that point, Hank is 45 with a 13-year-old son, not to mention Cotton has a half-Japanese love child who'd be over 50 years older than Good Hank Hill.
  • The eponymous family of The Loud House has 11 children, with the eldest being 17 and the youngest barely a year old. They're pretty evenly spread, though, so all of them have some similarly-aged siblings.
  • The Simpsons: "The Regina Monologues" all but outright states that Grandpa Simpson has an Abandoned War Child named Abbie from his WWII days. Homer is 38 years old, so going by the year that the episode came out (2003) he'd be 20 years younger than his long-lost half-sister.
  • Star vs. the Forces of Evil:
    • In the third season, teenager Marco visits Earth after living months in Mewni to discover his mother is pregnant again. He finally moves back in with his parents to meet his newborn sister Mariposa, 15 years his junior, and his friends keep assuming she's his daughter.
    • The Magic Book of Spells states that Eclipsa's uncle Jushtin was initially heir to the throne of Mewni, despite a tradition of matrilineal descent, because he had no female siblings. By the time Eclipsa's mother Solaria was born and took his place as heir, Jushtin was well into his teens.
  • Steven Universe: Gems don't have relatives in an exact human sense, but Amethyst thinks of the other ones made on Earth (her "Famethyst") like siblings. Because of an error in their Bizarre Alien Reproduction, she is five hundred years younger than the rest of them, but gems don't age, so this may as well be nothing.
  • Avatar: The Last Airbender:
    • Mai is fifteen years older than her toddler brother, Tom-Tom.
    • The comics also introduce a half-sister of Zuko’s and Azula’s who’s about 14 years younger than him and 12 than her.
    • In The Legend of Korra, there's a twelve-year difference between Jinora and her infant brother (who is born in the first book).
  • Helga from Hey Arnold! is at least twelve years younger than her sister Olga, a very well-accomplished college student, which only strengthens the one-sided rivalry Helga feels.

    Real Life 
  • It's somewhat expected of a king, if he isn't still married to his first wife, to try and produce an heir as long as possible, in order to avert any possibility of a Succession Crisis. Some of the best-known examples are seen in the monarchy of the United Kingdom:
    • Edward IV's eldest child was his daughter Princess Elizabeth, later the wife of Henry VII. Elizabeth was fourteen years older than her youngest legitimate sibling, Princess Bridget. (Edward also had a number of mistresses and is confirmed to have acknowledged several illegitimate children; it's unknown how much younger than Elizabeth some of these might have been.)
    • Elizabeth's son Henry VIII's need for a legitimate son and multiple marriages resulted in a large age gap between his eldest surviving child, Mary Tudor, and his youngest, Edward VI. When Edward ascended to the throne, he was nine. Mary was thirty.
    • George II and Queen Caroline had a total of ten children in nearly eighteen years. The eldest, Frederick, Prince of Wales, was born in February 1707; the youngest, Princess Louisa, was born in December 1724.
    • Their granddaughter, Queen Victoria, had children with Prince Albert until they were in their forties (and might have had more had he not died). The eldest, Princess Victoria, was born almost sixteen years before the youngest, Princess Beatrice; Victoria married when her youngest sister was just one, and her eldest son Kaiser Wilhelm II was only a couple years younger than his aunt Beatrice.
  • Some Presidents of the United States, or their children, have/had siblings drastically older or younger than themselves.
    • George Washington's father was a widower who remarried his much younger mother. In total, there were ten children between the two marriages. His half-brothers were much older than him and he was the oldest of his six full siblings. The oldest half sibling who survived to adulthood was his brother Lawrence (who was his father figure for most of his formative years), fifteen years his senior and twenty-two years older than the youngest child, Charles.
    • John Tyler had more children than any other President, due to being widowed during his presidency and then remarrying 21-year-old Julia Gardner. As a result, his youngest child was almost forty years younger than his oldest. Said child would also remarry and have kids as an old man, resulting in an over 130-year difference between them and the President. As of 2019, he's by leaps and bounds the earliest President to have living grandchildren.
    • Franklin D. Roosevelt's father James was a widower who married Franklin's mother while he already had an adult son from his first marriage. FDR ended up attending Harvard with his nephew "Tadd" Roosevelt, who was a few years older than him and mockingly called him "Uncle Frank" when they were in Groton together.
    • Donald Trump has been married three times, having kids with each wife. His youngest son Barron is 28 years younger than oldest son Don Jr. (who, in turn, is only 7 years younger than Don Sr.'s wife Melania), and Barron Trump has a niece only a year younger than him because of it.
  • Trevor Noah reveals during a stand-up that he has two younger brothers. One is 9 years younger, and the other is 20 years younger. He jokes about his mother comparing their accomplishments as the same.
  • Famous drummer Chad Wackerman has two younger brothers who are also drummers. The youngest is Brooks Wackerman (of Suicidal Tendencies, Bad Religion, and Avenged Sevenfold, among many other bands), who is a whole 17 years younger.
  • In interviews, actress Naomie Harris has mentioned her siblings, who are about twenty years younger than her.
  • Pete Townshend of The Who has a brother, Simon, who's 15 years younger than him.
  • Stellan Skarsgård had six children with his first wife and two more with his much younger second wife. As a result his eldest child, Alexander Skarsgård, is 36 years older than his youngest child. Even just among the children by Stellan's first wife, Alexander is 19 years older than his youngest full-blooded sibling, Valter.
  • Dusty Rhodes’ two sons Dustin and Cody have a 16 year age gap between them. Dustin is a child of Dusty’s first marriage and Cody is from his second; to put it in perspective, when Dustin started his career as an active wrestler, Cody was in elementary school. WWE would often refer to Cody as a “third generation superstar” despite not meeting the typical criteria (being the child and grandchild of a wrestler), considering him and Dustin to effectively be stars of different eras.
  • Charlie Chaplin was married four times and had eleven children altogether (including his first child, born in 1919, who died in infancy). He had two children with his second wife, born in 1925 and 1926. He then went on to have eight children with his fourth wife – the eldest Geraldine was born in 1944, and the youngest Christopher in 1962, making Geraldine Chaplin 18 years younger than her youngest half-sibling and 18 years older than her youngest full sibling. This also means Chaplin's youngest child was born when his eldest surviving child was 37 years old.
  • Harrison Ford had two children with his first wife, who are more than 20 years older than his two children with his second wife. And they in turn are more than a decade older than his adopted son with his third and current wife Calista Flockhart.
  • The three Schuyler sisters featured in Hamilton were historically just the three oldest children of a quite large family. It says a lot that by the time the youngest of their siblings was born, Angelica (the oldest of the trio) had children of her own and Eliza (the second oldest who was the title character's wife) had her first child on the way.
  • Michael Douglas has three children, but from two different wives (Catherine Zeta-Jones had two with him): his son Cameron (b. 1978), Dylan Michael (b. 2000), and Carys Zeta (b. 2003). Around the time Cameron had his first born child in 2017 (around 39 years old), his two younger siblings were high school-aged.
  • Vera Farmiga and her sister Taissa have a 21-year age difference between them, Vera was born in 1973 and Taissa was born in 1994.
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