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Hereditary Twinhood

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There are long-running beliefs that twinhood is hereditary and twins skip a generation, and these beliefs bleed into fiction. A family that has a previously-introduced set of twins (or triplets, or so on) can expect to have at least one more set waiting in the wings—even when this is nearly impossible according to real-life genetics.
The presence of established twin relatives, identical or fraternal, can often set up the birth of more twins or a long-lost twin showing up. If one of the parents is a twin, having twin children is often used to bring their story full circle (especially if the children are a male/female pair). Often, the newer or younger set of twins parallels the older one in some way: they bear strong similarities to the previous set that can extend to personality and behavior, take different life paths, or have an entirely different sibling relationship. In other words, the twin children are used as not-so-subtle Foils or Mirror Characters to the parents.
"Twins run in the family" will be used to explain all sorts of improbable twinning, such as a family having both fraternal and identical twins or multiple sets of identical twins, male fraternal twins going on to father twins, or sets of twins many generations removed from each other. A fictional species may even go as far as having a majority of births be multiples as a type of Bizarre Alien Reproduction.
In real life, as far as scientists know, identical twins are a spontaneous, random occurrence that doesn't run in families. Fraternal twins can run in the family, but only through the mother: some women are genetically predisposed to hyperovulationnote Fraternal twins are caused by two separate eggs being fertilized by two separate sperm, while identical twins are caused by a previously-fertilized ovum splitting in half. Men always release multiple sperm, but women most often ovulate one egg each month. If a woman has a hereditary predisposition to ovulate more than one egg at a time, her chances of having fraternal twins will be higher, whereas the father's DNA obviously won't affect how many ripened eggs his partner has available for his sperm to fertilize, and the idea of twins skipping a generation comes from a male twin passing the hyperovulation genes (which don't affect his own chances of having twins) on to his daughter. Artificial insemination and a previous birth can also increase the chances of a multiple birth. Fiction, however, will often treat identical twins and fraternal twins similarly.
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The Drake family on Pretty Little Liars. Mary Drake was revealed to be Jessica DiLaurentis's twin sister, which sets up the reveal that Spencer, since revealed to be a Drake, has an Evil Twin.
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Desperate Housewives: Lynette and Tom have identical twins Porter and Preston at the beginning of the series, which Lynette blames on twins running in Tom's family. When Susan says that she thought twins were determined by the mother, Lynette tells her to shut up. So when Lynette has a Surprise Pregnancy in Season 5, she gets pregnant with twins again, although one of them dies in utero.
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Heralds of Valdemar: One set of stories stars identical twin girls who have an older brother. Of the past five generations of their mother's family, three have consisted of identical twin girls with an older brother.
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In The Terror: Infamy Chester's girlfriend Luz ends up carrying twins, though they are sadly stillborn. This ends up foreshadowing that Chester himself is a twin, though he never knew that or the fact that he was actually adopted.
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The Fall of the House of Usher: Madeline and Roderick are Half-Identical Twins. One interpretation is that this sets up the twist that the Ushers are "all one line"; they were all born from Brother–Sister Incest between twins and the "taint" upon their house is as a result of this.
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The Belgariad: At the end of The Malloreon, Polgara (who had a twin sister) has twins; Belgarath says it's a family trait. More justified than some examples, since Polgara's mother Poledra is a wolf shape-changed into a human woman. Female wolves may have up to six cubs in a litter.
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The Simpsons:
One story in "Treehouse of Horror VII" has Bart be the conjoined twin of an apparently Evil Twin called Hugo, following his identical twin maternal aunts Patty and Selma.
The Flash Forward episode "Future Drama" has Nelson get both Always Identical Twins Sherri and Terri pregnant. Later, both are shown to have given birth to twins.
Highly exaggerated case in another Flash Forward episode, "Holidays of Future Passed". Apu and Manjula are briefly shown with their now adult octuplets, who themselves each had a set of octuplets.
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WandaVision uses "twins begetting twins" for a different kind of plot twist. Wanda is a fraternal twin, and gives birth to fraternal twin sons (who have similar powers to herself and her brother Pietro, respectively) when she had just been expecting one child. But seeing her sons reminds her of her brother, who had gone unmentioned since his death — which in turn causes the fragmented sitcom reality to unravel.
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Jane the Virgin: Petra gives birth to identical twin daughters, which sets up the reveal later in the season that she herself is an identical twin. And the finale pulls one last twist by revealing she is actually a triplet.
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The Flash: Prior to his death in Crisis on Infinite Earths, Barry Allen fathered fraternal twins—Don and Dawn—with his wife, Iris. It was later revealed that Barry himself had a long-lost identical twin brother who had been Separated at Birth and had been raised by the Thawne family, eventually becoming the villain Cobalt Blue. Since Don and Dawn inherited his superspeed, this led to the line in The Life Story of the Flash: "Twins ran in the Allen family ... literally."
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Night World: Hinted at with the Harman family. Edgith's younger siblings, Elspeth and Emmeth, are fraternal twins, and Edgith's daughters were also twins. Hellewise, the ancient founder of the family, was a twin too.
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Harry Potter: Two of Molly's brothers, Fabian and Gideon, are twins (they die before the series begins). Molly has a set of twins, Fred and George, among her own seven children.
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Michael and Lindsey from Arrested Development are established as being twins when they're introduced. It's later revealed that their father has a twin brother himself. Later subverted when it's revealed that Lindsey is actually adopted.
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On Riverdale, Cheryl is the Angsty Surviving Twin to Jason. In hindsight, Cheryl and Jason being twins is a hint that twins run in their family.
Their father Clifford is revealed to have a long-lost identical twin brother in season 2.
Jason himself fathers fraternal twins with Polly—Juniper and Dagwood. Cheryl attributes this to twins running in the Blossom genes, even though this would be dependent on the mother's genes, not Jason's. However, it's established that the mother is in fact Jason's third cousin, so could have gotten that part of the Blossom genes, or Cheryl could have been unclear on the genetics and is known to be very arrogant about her family heritage.
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The X-Men: Evolution fic All's Fair in Love and War has Jean Grey and Lance Alvers as fraternal twins. Jean and Scott Summers's first set of children, Joseph and Monica, are fraternal twins as well.
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Twins (1988): At the end, the twin brothers have married twin sisters, and each couple has twin babies.
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Hulk and the Agents of S.M.A.S.H.: In "Days of Future Smash: The Tomorrow Smashers", the Hulk is sent into the future, and encounters a new team of Smashers. Among them are two red gamma mutate twins named "Thad" and "Betsy", who are heavily implied to be Red Hulk's descendants. After he returns to the present, Hulk nonchalantly suggests that twins run in Red's family, which Red confirms (then confusedly asks how Hulk knew that).
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The World of David the Gnome: While explaining the idiosyncrasies of gnomish biology, David points out that gnomes only have children once in their lives and they're always twins.
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A Thing of Vikings: Twins seem to run in the Thorston clan. Ruffnut and Tuffnut's father is Thicknut, who is twins with Chestnut, and Ruffnut herself has twins with Magnus.
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Wolves of the Calla: In Calla Bryn Sturgis, the main setting of the story, almost all births are twins, with having just one child being a rarity. It is lampshaded however that this is not a natural phenomenon, and the abundance of twins is what makes Calla a target for the Wolves, who want 1 child of each pair of twins every 23 years in order to drain them from the innate material responsible for Twin Telepathy.
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In Dan and Mab's Furry Adventures, the Cubi clan of Zezzuva specifically has this as their clan quirk. Zezzuva herself gained her position from her twin sister by killing her and using her power to become clan leader.
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In Lightning, Thelma is a twin (her sister died in a fire when they were adolescents) and is pregnant with twins at the end of the book.
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The Trebond family in the Tortall Universe displays this, starting with Alanna and Thom in Song of the Lioness and later on with Alanna's own children Alianne (protagonist of Trickster's Duet) and Thom. Alianne herself ends up with triplets.
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Godzilla: King of the Monsters (2019): Dr. Ilene Chen, Monarch's chief mythologist and resident Ms. Exposition, not only has an identical twin sister, but also identical twin daughters, her mother and aunt are identical twins, and her grandmother and great-aunt are identical twins. The novelization takes this even further, confirming that twins run in Ilene's family. Word of God reveals that this is meant to settle Ilene and her sister Ling into the roles of the Shobijin, Mothra's twin fairy priestesses from the original films, so in this case there's a supernatural justification.
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The Thrawn Trilogy: Leia is Luke's fraternal twin sister. In The Last Command, she births twins: Jacen and Jaina.
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The Brittas Empire: The titular Gordon Brittas has a twin brother (Horatio Brittas), becomes father to no less than two sets of twins over the course of the series and is apparently part of the fourth generation of twins in his family.
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Secret Histories: Justified in the climax of the first book as the Awful Truth behind the Drood family. Their deal with an Eldritch Abomination causes all Droods to be born with an identical twin, who is sacrificed to the entity in exchange for magical power.
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A Song of Ice and Fire:
House Targaryen has had multiple cases of twins throughout the generations. If the propensity for twins has a genetic component, then the multiple cases of twins may be influenced by the Targaryens' Royal Inbreeding.
Prince Aegon Targaryen (son of King Aenys) and his sister-wife Princess Rhaena had twin daughters, Princess Aerea and Princess Rhaella, who were identical in looks but opposites in personality. Aerea and Rhaella both died without issue, although other members of the family (descended from Aenys' other children) continued to produce twins.
Prince Daemon Targaryen and Lady Laena Velaryon (the latter of whom was related to the Targaryens through her mother) had twin daughters, Lady Baela and Lady Rhaena, who looked identical as children, but became easier to tell apart as teenagers due to their differing personalities reflecting their appearances. Daemon's nephew King Aegon II and niece Queen Helaena had fraternal twins, Prince Jaehaerys and Princess Jaehaera. Jaehaera was severely traumatized after witnessing her twin brother's murder. Princess Elaena Targaryen, daughter of King Aegon III (who was Prince Daemon's son and Aegon II's nephew)note Aegon was technically Daemon's great-nephew too, as Aegon's mother Rhaenyra was Daemon's niece; Aegon II's father was Aegon III's grandfather had bastard twins, Jon Waters and Jeyne waters, with her lover Alyn Velaryon.
King Aegon IV (grandson of Daemon) fathered two sets of twins; the only one who is named is Princess Daenerys (not the Mother of Dragons – who was named after her), although her brother was stillborn. Daemon Blackfyre, the bastard son of Aegon IV and Aegon III's daughter Princess Daena, had twin sons, Aegon Blackfyre and Aemon Blackfyre. Daemon Blackfyre's last known descendant, Maelys, was said to be a twin, but according to rumor ate his twin in the womb. Prince Rhaegel Targaryen, son of King Daeron II and Queen Myriah Martell and great-grandson of Aegon IV, had Prince Aelor and Princess Aelora with Lady Alys Arryn; the twins were wed to each other, although Aelora went mad with grief after accidentally killing Aelor.
To a lesser degree, twins appear to run in House Lannister too:
Amongst the Lannister family ancestors, Jason Lannister and Tyland Lannister were twin brothers, and Gerold Lannister had twin sons, Tywald and Tion, referred as to as "Gerold's glorious twins" by Maester Yandel.
Current family patriarch Tywin Lannister has fraternal twins Cersei and Jaime (who are secretly lovers as well). Tywin's brother Kevan Lannister also has twins, Willem and Martyn.
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Members of the Severin family in Muted always birth daughters in pairs, with the exception of Avaline, who is an only child. We learn later in the story that this wasn't always the case, as she did have a twin but her own mother Athalie sacrificed her daughter as the price to have a demon murder her own sister and her children.
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Helena and Sarah on Orphan Black are revealed to be identical twins within a group of identical clones, who were mostly implanted in different birth mothers—but Sarah and Helena's embryo split into two. This likely explains why they don't have the sterility and associated ovarian cancer the other clones were designed with, since genetic transcription errors occur when an embryo splits. Helena then carries identical twin boys of her own later in the show.
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Eerie, Indiana: This is invoked in the "Foreverware" episode. The plot involves a family whose members have been sleeping in giant tupperware boxes to stunt their aging for three decades. The episode ends with the family accelerating the "spoiling" process instead slowing/stopping it, aging the twin sons thirty years overnight. When found doing work outside their house by someone unaware of the family secret, they pull a Pretending to Be One's Own Relative and claim that twins run in the family.
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In Another twins run in Mei's family. Besides Mei and her Separated at Birth twin sister Misaki their birth mother Mitsuyo was also a twin, and Mei was adopted by Yuikyo, the other sister, after she suffered the Tragic Stillbirth of her own child and financial problems in Mitsuyo's family meant they couldn't afford to care for two children.
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Legion of Super-Heroes: Twin births are the norm on Winath, to the point that children born without a twin, like the villain Lightning Lord, are outcasts in Winathian society.
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Red Dwarf: Apparently, Vidal Beasts (creatures which are briefly mentioned in a Noodle Incident in the parent series) always give birth to children in pairs, with one always being a herbivore, and the other always being a carnivore.
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Monster: Johan and Anna Liebert are identical twins. It's later revealed that their own mother was also a twin, but her sister died at a young age.
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In The Thirteenth Tale, Isabelle Angelfield, who is the fraternal twin sister of the violent possessive Charlie, has identical twins, Emmeline and Adeline. A heavy amount of Incest Subtext exists between Charlie and Isabelle, and the twins are noted to behave a lot like Charlie, so the townsfolk speculate heavily that Emmeline and Adelaide are twins born of Twincest.
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In Sekirei, the twins Hikari and Hibiki are both in a relationship with their Ashikabi Kaoru, and the epilogue reveals that the two give birth to two sets of twin boys.
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In Fatal Frame II, Ryokan Kurosawa was a twin who has twin daughters of his own. However, due to Minakami Village having a ritual based around One Twin Must Die, he was the only one left by the time said daughters were born.
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In Fate/hollow ataraxia the Edelfelt family of magi has a unique bloodline ability that lets two members inherit the family's magic crest at once. During the third Holy Grail War the Edelfelt sent twin sisters to represent the family, and in the present day the granddaughter of one of the two, Luviagelita, also has a twin sister.
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Friends: The final two-parter sees Erica, the woman whose baby Chandler and Monica are set to adopt, go into labour. The three of them are shocked during the birth to discover that it's twins, and as they discuss it, Erica notes that, "Twins actually run in my family!"
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Sabrina the Teenage Witch: The "Family Secret" that Sabrina has to learn to earn her Witch's License is that every member of the Spellman family is born with a twin, and in all witch twins one of them is inevitably the Evil Twin, who will be imprisoned in the Twin Cities in the Other Realm. Sabrina's twin is named Katrina, and there's a series of tests to determine which one of them is evil (foregone conclusion: it's Katrina). However, the "twins" are not actually siblings but inexplicably identical relatives from different branches of the family.
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Dragonriders of Pern: In Dragonsdawn, Barr meets up with Sallah after years apart. Barr tells Sallah that she now has five children, including a set of twins; after she gave birth to the twins, her husband informed her that he was a twin.
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Young Avengers: The series has a complex example. Scarlet Witch is the fraternal twin of Quicksilver, and Speed is the reincarnation of one of her magically-conceived identical twin sons. He mirrors Quicksilver's powers; his "brother" Wiccan mirrors Wanda's. In one Bad Future, Kate Bishop is pregnant with Speed's twins.
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Gravity Falls: Dipper and Mabel are Half-Identical Twins, which foreshadows the reveal that their Great-Uncle Stan is an identical twin.
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The following is a list of statements referring to the current page from other pages.

 Hereditary Twinhood
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Artistic License – Biology
 Hereditary Twinhood
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Family Twists Index
 Hereditary Twinhood
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Generational Tropes
 Hereditary Twinhood
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Twin Tropes
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