->''"Two brothers. One woman. Trouble."''
-->-- '''Flakita''', ''Series/TheXFiles'', "El Mundo Gira"

In simple terms, a LoveTriangle where two of the parties involved are siblings, who both love (or at least try to "get") the third party.

This alters the dynamic in various ways, given the famously rather [[SiblingRivalry complicated relationships between siblings]] in the first place. Might go anywhere from a friendly rivalry, one deciding that they [[IWantMyBelovedToBeHappy want their siblings to be happy]] or straight into CainAndAbel territory. In FairyTales, often inspires the BrideAndSwitch.

If they don't hate each other from the start the TriangRelations version of the triangle is a special subset of #8 or #9. If the former, it will turn into a case of {{Polyamory}}.

Usually does ''not'' involve BrotherSisterIncest.

See also TwoGuysAndAGirl, SiblingRivalry, and SettleForSibling. When a fourth party is added in the form of a sibling to the third party, see DoubleInLawMarriage.


[[folder:Anime & Manga]]
* ''Manga/PokemonDiamondAndPearlAdventure'' has something similar; both [[TheRival Jun]] and his ''father'' [[DirtyOldMan Palmer]] like Mitsumi.
* ''Manga/SamuraiHaremAsuNoYoichi'' has a variant of this (Ayame likes Youichi who is kind of a pervert but seems to prefer Ibuki)
* ''Manga/SchoolRumble'' has a one-sided variant: Yakumo likes Harima who likes Yakumo's sister Tenma.
* ''Anime/RahXephon'' has a more serious example with [[spoiler: Megumi and Haruka both liking Ayato. Megumi later decides to back off.]]
** In fact, there's a recursive example (two of the characters are in both love triangles) kinda, sorta with [[spoiler:Dr. Kisaragi and Ayato, who are clones, both loving Haruka. At the end, Haruka and Ayato get back together.]]
* ''Anime/InfiniteRyvius'' has this as [[spoiler:the origin of the CainAndAbel feud of Yuki and Kouji Aiba; they had both fallen for the same woman (implied to be [[UnluckyChildhoodFriend Aoi]]), and Kouji [[IWantMyBelovedToBeHappy bows out for both their sakes]] when he finds out. Yuki takes that as an insult to the woman, and his disgust for his brother lasts for most of the series.]]
* At one point in the ''Manga/DNAngel'' anime, both Risa and Riku are in love with Niwa. (With the added complication of Dark being in love with... One of them. It's complicated.)
* Chocolat and Tira Misu for Carrot Glace in ''Manga/SorcererHunters''. [[spoiler: Tira wins in the manga]].
* In ''Manga/{{Spiral}}'', Ayumu was in love with his sister-in-law, and lives with her after his brother disappears.
* In Adachi Mitsuru's ''Manga/{{Touch}}'', twin brothers Katsuya and Tatsuya both love their childhood friend Minami. Older twin Tatsuya backs off, allowing the younger Kazuya to win at everything, including love seemingly. Then… Kazuya dies in an accident, and the story follows the relationship that develops after this tragedy.
* In ''Manga/OuranHighSchoolHostClub'', manga version, both Hikaru and Kaoru are in love with Haruhi. [[spoiler:Kaoru backs out because "Hikaru's more important [to him]".]]
* This also starts off the plot of ''Manga/{{Judge}}'': Hiro has a secret crush on his friend Hikari, but his older brother Atsuya [[LoveConfession confessed his own attraction first]], so he kept quiet about it. However, at the start of the series, he decides to tell her anyway, and secretly derails the pair's plans to meet for a date, figuring she might be more receptive to his confession if she thought Atsuya had stood her up. [[spoiler: Atsuya gets hit by a car because of this.]]
* ''Anime/PleaseTwins'' plays out like one of these. The plot consists out of two girls that turn up at a boy's house claiming to be his twin sister. The boy and the girls need to find out who is the real twin sister while falling in love with each other.
* ''Manga/{{Simoun}}'' has an unusual example: a Type 5 triangle where Alti [[BrotherSisterIncest loves her older sister]] Kaimu who crushes on Paraietta who doesn't have feelings for any of them (because [[LoveDodecahedron she's in love with Neviril]]).
* ''Manga/WanderingSon'' initially had a LoveTriangle between two siblings. In middle school Maho fell for a boy named Riku, so she asked her {{transgender}} sister Nitori to dress up as a girl after Riku had fallen for her. Even after he finds out Nitori's sex he seems to be somewhat attracted to Nitori. It eventually faded though and he and Maho became a happy couple [[spoiler:who are still together even at the end, when Nitoro goes off to college]]. It's never quite said whether Nitori herself had feelings for Riku, but she later gets a girlfriend.
* BrotherSisterIncest version in shojo manga ''Manga/VampireKnight'' with both Kuran brothers, Rido and Haruka, in love with younger sister Juri. (Marriage between siblings is common among [[OurVampiresAreDifferent pureblood vampires however]]). And Juri chooses [[spoiler: Haruka]] anyway. [[spoiler: Which later means ''trouble'' for Juri and Haruka's daughter Yuuki, since Rido reappears [[ReplacementGoldfish and becomes fixated on]] ''her''.]]
* In ''Manga/MaidSama'', Hinata is in love with Misaki, and Misaki's little sister Suzuna has a crush on him. [[spoiler:It works out fine, since Hinata ends up [[SettleForSibling married to Suzuna]] in the DistantFinale set at Misaki and Usui's wedding]].
* In ''Anime/StarDriver'' pink-haired twin sisters Mizuno and Marino You both fall for the same boy, male lead [[PrettyBoy Takuto]] [[NiceGuy Tsunashi]]. [[spoiler: It is later revealed that Marino is in fact a clone created by Mizuno's first phase power, which may account for them both liking 'the same things.']]
* A variation of this can be found in ''Manga/TheWorldGodOnlyKnows'', with [[spoiler:the Jupiter Sisters, who possess the bodies of girls belonging to Keima's UnwantedHarem. Somewhat subverted later on, after one of them revealed that they're not actually related and the "Jupiter Sisters" is a collective title bestowed to six priestesses whose powers complement each other to a devastating synergistic effect. They truly regard of each other as sisters, though.]]
* Koki, Tanpopo, and Yoji in ''Manga/{{Imadoki}}'' It's more one-sided on Tanpopo's end, as she and Koki very clearly have feelings for each other, but when Yoji confesses his own feelings for Tanpopo, she briefly dates him.
* ''Manga/ShinshiDoumeiCross'' has [[spoiler: Shizumasa and Takanari]], both in love with main heroine Haine.
* ''Manga/{{Claudine}}'' has two. [[spoiler: Both of the Lacques siblings (Louis and Cecilia) were lovers to the main character's father Auguste, and later both Claudine and his elder brother Andre fall for the same girl, Sirene. [[FromBadToWorse Both cases end up in death and tears]].]]
* Played with in ''Manga/AnatoliaStory''. [[spoiler: Yuri's twin caretakers Ryuhi and Shala have the same taste in men, thus they fall for Kail's advisor Kikkuri and visit him at night, with Kikkuri not realizing that he's sleeping with them both since he can't distinguish them. When the girls get pregnant at the same time and the deal is revealed… [[TwinThreesomeFantasy Kikkuri marries them both]], and the seven members of their little family (since ''both'' girls gave birth to twins) live happily from then on.]]
** And [[UnwantedHarem one of the guys who loves Yuri]] is Prince Zannanza, who also happens to be one of Kail's half-brothers.
* Happens in Yoko Hanabusa's ''Manga/{{Lady}}'', with the Russell half-sisters [[ProperLady Sarah]] and [[PluckyGirl Lynn]] having feelings for [[PrincelyYoungMan Arthur Brighton.]] [[spoiler: Sarah and Arthur get together, while Lynn's feelings shift towards Arthur's younger brother Edward.]]
* In ''Anime/RevolutionaryGirlUtena'', both [[spoiler: Anthy]] and her brother [[spoiler: Akio manage to bed Utena ''and'' each other ([[RapeAsDrama not very willingly from Anthy's side, tho]]).]] A type 8 TriangRelations with some positively disturbing sex scenes. [[spoiler: Nanami]] finds out and is traumatized by the knowledge, so she tries to warn [[spoiler: Utena]] [[TheCassandra to no avail]].
* In ''VideoGame/TheKingOfFighters'' RadioDrama ''The Sun and the Moon'', [[AntiHero Iori Yagami]] finds himself in a triangle with his two {{Morality Pet}}s, the sisters [[BrokenBird Konoe]] and [[IllGirl Kikuri]] Tanima. [[spoiler: He ends up with… neither of them: he leaves Japan [[ItsnotYouItsMe to protect them from himself]], and Kikuri dies of illness later.]]
* The ''Manga/VampirePrincessMiyu'' manga gives us [[spoiler: Kyo Kitami and the Minami sisters, Mari and Rima.]] The guy is fascinated with the older sister [[spoiler: Rima [[OurMermaidsAreDifferent who is actually a cute mermaid kept in a tank]]]], while the younger sister [[spoiler: Mari is tasked with [[HoneyTrap luring Kyo so their Shinma dad can drink his blood]], [[InLoveWithTheMark but ends up falling for him…]]]]
* ''Manga/FullmetalAlchemist'':
** Apparently, Ed and Al used to have this in their childhood, fighting over who would marry their friend Winry, who wasn't interested in either of them. Eventually, Winry did develop a thing for Ed and Ed returned her feelings; Al aknowledged this and went the ShipperOnDeck way without any problems.
** In the [[Anime/FullMetalAlchemist first anime]], [[spoiler: Scar]] was in love with his older brother's girlfriend. She later died and [[spoiler:Scar's]] brother [[LoveMakesYouCrazy fell enough into despair]] to try [[spoiler:Human Transmutation to bring her back, before his own death... unwittingly creating the homunculus Lust in the process. The brother's FamousLastWords are basically a mix of an apology to Scar ("I'm sorry, you probably deserved her more") and a reaffirmation of his feelings ("But will see her first").]]
* ''Manga/KimiNiTodoke'' has a variation: Ryu is a PatientChildhoodLoveInterest to Chizuru, who has a crush on his older brother, Toru.
* ''Manga/SakuraTrick'': Haruka has the affections of both Sonoda sisters. Since her relationship with the younger one is the entire basis of the series, it's easy to guess how things will turn.
* A good portion of ''Manga/PrincessJellyfish'''s plot revolves around two brothers both liking the same woman, one being a WholesomeCrossdresser and the other not even realizing the woman is the same person as the geeky, {{meganekko}} he hates.
* ''Anime/{{Free}}'' sorta takes this direction in the second season, with both Mikoshiba brothers (eldest Seijuuro and youngest Momotarou) crushing on Gou Matsuoka. [[ObliviousToLove She doesn't seem to be aware of it.]]
* ''Anime/TengenToppaGurrenLagann,'' kind of--[[BashBrothers Simon and Kamina]] aren't brothers in the biological sense, but always refer to themselves that way and consider themselves as such anyway. Simon initially has a PrecociousCrush on [[ActionGirl Yoko]], and gets a hard kick in the heart when he sees her and Kamina having their FirstKiss. Romance between him and Yoko more or less vanishes after that, though, even with [[spoiler:[[DeathOfTheHypotenuse Kamina dying that same episode]]]]. [[note]](Most likely ''[[FridgeBrilliance because]]'' of [[spoiler: Kamina's death]], since it [[HeroicBSOD deeply shakes Simon's mind]] and Yoko [[TheMourningAfter is implied to have never loved another guy like she loved him]].)[[/note]]. Anyway, the trope soon becomes moot since Simon soon meets [[NiceGirl Nia]] [[SecondLove and falls for]] ''[[SecondLove her]]''…
* Averted in ''Manga/FushigiYuugiGenbuKaiden''. [[spoiler: Both of the Urumiya twins, Hagas and Tegu, fall for Princess Firuka… but at ''different times''. Hagas, who loved Firuka because [[FlorenceNightingaleEffect she helped him live a little longer]], dies in a SelfSacrificeScheme to release Tegu from Firuka's ArchnemesisDad ''and'' give him the title of "Urumiya" Senshi; Firuka meets the now free Tegu, he tells her how much Hagas loved her [[TheStoic even when he couldn't show it]], and later they get married.]]
* The biggest example in ''Anime/{{Futakoi}}'' is the love triangle between protagonist Nozomu and the Ichijou twins; Kaoruko and Sumireko. The twins both love Nozomu and this causes a bit of tension between the twins.
* In ''Anime/MacrossZero'', sisters Sara and Mao Nome both end up falling in love with Shin Kudo. Mao is more openly affectionate, while Sara's feelings are more conflicted due to Shin being an outsider.
* A variation occurs in one of the ''Manga/TheLegendOfZelda'' manga based off of ''VideoGame/ZeldaIITheAdventureOfLink''. The current Zelda and the recently-revived Sleeping Zelda both fight over Link at the end. They're distant relatives as the latter had been comatose for centuries, and the current Zelda is presumably a descendant of her brother.
* ''Kyou Kara Yonshimai'' has Sakura's friend falling for her. He later meets her older sister and is attracted to her [[UnsettlingGenderReveal until]] learning that she is the "[[{{Transgender}} brother]]" he called gross and obnoxious for living as a woman. Kashiwa finds him annoying for [[BigBrotherInstinct harrassing her sister]] and is uninterested in him (plus she has a girlfriend anyway).
* In chapter 39 of ''Manga/KaguyaSamaLoveIsWar'', we find out that the president's younger ''sister'' has a crush on Kaguya just like him. Subverted once we learn via Kei's focus chapters that she simply admires Kaguya as a person and as a potential future sister-in-law.
-->[[LampshadeHanging Siblings tend to have similar tastes]].
* Taken UpToEleven with ''Manga/FruitsBasket'', which is arguably the TropeCodifier for Sibling-{{Themed Harem}}s that don't resort to BrotherSisterIncest.
* ''Manga/{{Horimiya}}'' has something of an inversion where Sawada tries to compete with Miyimura for Hori's affection, but she quickly come to view him as an older brother since they're next door neighbors and she recently lost her actual brother.
* In ''LightNovel/DestructionFlagOtome'', Prince Gerald worked hard to keep his brother Alan from realizing that he was in love with Katarina in order to avoid this trope and more rivals, but Alan eventually catches on and begins pursuing Gerald's fiancee Katarina, who isn't really interested in either of them because she's too in love with cake to notice anything else.

* [[http://www.epilogue.net/art/31502-the-blue-hour These]] [[http://www.epilogue.net/art/31500-jealousy two pictures]], together with the titles and artist's comments, very briefly tell one of these stories, ending with MurderTheHypotenuse.

* In the Literature/{{Child Ballad|s}} ''The Twa Sisters'', the sister's motive in drowning her sister is jealousy.

[[folder:Comic Books]]
* ''Franchise/XMen'':
** In ''ComicBook/UltimateXMen'', Lorna (aka Polaris) dated Scott (aka ComicBook/{{Cyclops}}) in the backstory, and his brother Alex (aka Havok) in the series' present.
** In the normal continuity the Summers brothers had another one: Madelyn was married to Scott and later fell for Alex.
* In ''ComicBook/BuffyTheVampireSlayer [[PostScriptSeason Season Eight]],'' Buffy realizes that she may have romantic feelings for long-time platonic friend Xander. She goes to tell him, only to discover that he has just started a relationship with her sister, Dawn. (This is all made even more complicated when you remember that Xander had a crush on Buffy in season one and Dawn had a PrecociousCrush on Xander in season five).
* In one ''Franchise/{{Batman}}'' ''Black and White'' animated comic "Two of a Kind", Harvey Dent is rehabilitated by a combination of therapy, plastic surgery, and a romance with the plastic surgeon. Said plastic surgeon has a twin sister who is immediately smitten with Harvey because she is even crazier than Two-Face and believes they are two of a kind. She tempts Harvey into cheating on his fiance, but he eventually breaks it off with her. It ends in tears [[ChronicVillainy just as all of Harvey's attempts]] [[StatusQuoIsGod to be free of Two-Face do]].
* Issue #9 of ''ComicBook/MyLittlePonyFriendsForever'' involves the identical twin unicorn {{Con Artist}}s Flim and Flam having broken up over their mutual attraction to a librarian named Marian. Granny Smith gets them back together by revealing she was the non-sibling member of one of these herself in her younger days, with the "Jonagold Brothers" never speaking to each other for the rest of their lives after she backed out of their feuding over her.

[[folder:Fairy Tales]]
* Literature/{{Cinderella}}'s stepsisters have been known to cut off parts of their feet to fit in the shoe.
* In "[[http://www.surlalunefairytales.com/cinderella/stories/birch.html The Wonderful Birch]]", the witch made the items fit her daughter; her stepdaughter let the prince know the truth and so they used the witch's daughter to make a magical bridge and he married the stepdaughter; the witch then replaced the stepdaughter with her daughter after childbirth.
* In "[[http://www.surlalunefairytales.com/authors/grimms/135whiteblackbride.html The White Bride and the Black One]]", the stepmother murders her stepdaughter en route to the wedding and substitutes her own daughter.
* In the Chinese tale "Beauty and Pockface", Pockface takes Beauty's place after she visited her family, and weeps and wails about how he never really loved her because he no longer does after she contracted smallpox.
* In "[[http://www.sacred-texts.com/neu/celt/mfli/mfli04.htm Fair, Brown, and Trembling]]", Trembling goes to church, and a prince falls in love with her, and out of love with Fair. After she has a baby, Fair pushes Trembling into the sea and takes her place.
* In "Literature/TsarevitchIvanTheFireBirdAndTheGrayWolf", after they murder Ivan, his brother draw lots about who gets to marry Helen the Beautiful.
* In "[[Literature/TamCam The Story of Tam and Cam]]", Tam is murdered by her stepmother, who gets the king to marry Cam in her place, but Tam keepts coming back.
* In "[[http://www.surlalunefairytales.com/authors/grimms/57goldenbird.html The Golden Bird]]", the brothers try to murder their younger brother and keep the beautiful maiden.
** Similarly in "[[http://www.mythfolklore.net/andrewlang/368.htm The Golden Blackbird]]", "[[http://www.mythfolklore.net/andrewlang/392.htm The Golden Mermaid]]", and "[[http://www.mythfolklore.net/andrewlang/412.htm The Bird 'Grip']]".
* In "[[http://www.surlalunefairytales.com/authors/grimms/97wateroflife.html The Water of Life]]", the older brothers try to woo the princess who had agreed to marry their younger brother.
* Averted in [[http://www.tonightsbedtimestory.com/snow-white-and-rose-red/ "Snow-White and Rose-Red"]]: it turns out that the prince whom they free from an evil dwarf's spell has a younger brother at home. [[DoubleInLawMarriage Snow-White marries the elder prince and Rose-Red gets together with the younger.]]

[[folder:Fan Works]]
* In ''Franchise/{{Superman}}'' story ''Fanfic/SupermanOf2499TheGreatConfrontation'', Alan and Adam Kent love [[ComicBook/{{Supergirl}} Katherine]]. Kath finds Adam attractive but she eventually chooses Alan. Adam doesn't take her choice well ''at all''.

[[folder:Films -- Animation]]
* ''WesternAnimation/StrangeMagic'': [[PrincessClassic Princess Dawn]] is accidentally [[LovePotion love potioned]] into loving [[EvilOverLord The Bog King]] who views it as an annoyance. Later, her sister [[TomboyPrincess Marianne]] breaks in to rescue her. She and the Bog King begin to fall in love over their [[BloodKnight shared loved of fighting]]. [[spoiler: Dawn is broken out of the love potion when she has a LoveEpiphany for someone else, ending the triangle without acrimony. ]]

[[folder:Films -- Live-Action]]
* ''Film/DuelInTheSun'' was largely about this.
* In the film ''The Man in the Moon'', Emily Warfield and a very young Reese Witherspoon are sisters both in love with Jason London. [[spoiler:He dies, forcing the sisters to reconcile.]]
* ''Film/BeforeTheDevilKnowsYoureDead''
* The Creator/PatrickDempsey film ''Some Girls'' has a young Dempsey falling for three sisters, although he sleeps with only one and in the end doesn't wind up with any of them.
* The Emperor murdered his brother and married his brother's wife in ''Film/LegendOfTheBlackScorpion''. Wan didn't want anything to do with this, but she submits. Or appears to.
* Implied in ''Film/TheLoneRanger'' with Dan and John with Rebecca before John left to learn law. Dan married Rebecca and have a son, Danny Reid (Jr.). It is implied that Dan knows John and Rebecca still loves each other.
* Linda and Julia Seton get into one when Linda falls in love with Julia's fiancé Johnny in ''{{Film/Holiday}}''. Linda, who loves her sister, staunchly refuses to act on her feelings until the end of the movie.
* Silent comedy film ''Film/HandsUp'' features the protagonist falling in love with each of a pair of sisters. He resolves this dilemma by--''[[MarryThemAll marrying both of them]]''.
* In ''Film/IWakeUpScreaming'', Frankie the promoter takes an interest in Vicki, plucks her from waiting tables, and makes her a famous model--but winds up falling in love with her sister Jill, much to Vicki's displeasure.
* ''Film/DanInRealLife''; the titular character meets a woman at a bookstore and they hit it off. A few minutes later, he finds out the woman is his brother's new girlfriend.
* Somewhat odd version in ''Film/WhileYouWereSleeping''. Lucy has a crush on Peter, and when he winds up in a coma due to an accident, his relatives misunderstand the situation and think she's his fiancee. His brother Jack is very attracted to Lucy. When Peter comes to, he thinks he's lost some memories of Lucy, but is game to give a relationship with her a chance. Meanwhile, Lucy's finding out that she's attracted to Jack. [[spoiler:She winds up with Jack, and all parties consider this for the best.]]
* In ''Film/AtlanticCity'', Sally's husband Dave shows up in Atlantic City with Sally's sister Chrissie, whom Dave has impregnated, in tow. Sally is super-pissed about this.
* ''Film/NorthSeaTexas'' gives a non-heterosexual example. Siblings Sabrina and Gino are attracted to Pim, who returns feelings for the latter.
* In ''Film/ThePatsy'', Pat is besotted with her sister Grace's boyfriend Tony. Tony has no clue. Grace for her part is also attracted to another man, complicating the situation.
* Stanley in ''Film/InThisOurLife'' steals her sister's husband, Peter, whom Roy was completely in love with.
* ''Film/CrazedFruit'': Both brash, confident Natsuhira and his meek little brother Haru fall for gorgeous Eri. She seems to really love Haru but at the same time have a deep carnal attraction to Natsuhira. The triangle ends with violence.

* In the ''TabletopGame/{{Warhammer}}'' novel ''Defenders of Ultuahan'' two brothers love the same woman. One brother [[TheUriahGambit leaves the other brother to die during a skirmish]]. This comes back to bite him in the arse.
* In Harry Harrison's ''Literature/TheStainlessSteelRat Goes to Hell'' Digriz' two twins fall in love with the same woman. The problem is solved by going to a parallel universe and fetching an alternate version of said woman.
* ''Literature/CassonFamilySeries'': Bill cheated on [[spoiler:his wife Eve with Eve's twin sister Linda]]. He knew her first, so Eve didn't even really mind.
* Sandy and Dennys in ''Many Waters'' both love Yalith and she loves them both back. Unfortunately, the relationship as such is doomed because the flood's coming and Yalith isn't allowed on Noah's ark.
* Played with darkly in ''Film/{{Hellraiser}}'': [[WickedStepmother Julia]] has married [[UglyGuyHotWife Larry]], but eventually murders him in preference for his brother [[EvilUncle Frank]], who seduced her prior to the events of the film. It doesn't really go well for her....
* Literature/TheBible has a rather complicated example with Jacob, Rachel and Leah. Jacob fell madly in love with Rachel, and worked for her father/his uncle Laban for seven years in order to earn the right to marry her. However, in Rachel's society it was shameful for the younger daughter to be married first, so (with some help from the very thick veils used at the time, as well as some alchohol) Laban switched Rachel out with Leah, with Jacob only finding out during the wedding night. Rachel and Laban then forced Jacob to work ''another'' seven years so he could marry Rachel for real. One can't help but wonder what poor Leah felt about this arrangement. (In a slightly unrelated note, this is why we have the tradition of the bride removing her veil in Western weddings.)
** For an added complication, a Jewish legend says that Leah was originally destined to marry Jacob's older brother, Esau, who was [[CainAndAbel far less meritorious]]; Leah was overwrought and prayed to God, who then arranged things [[MarryThemAll so she could marry Jacob as well.]]
*** And, to make things even ''more'' complicated, two handmaidens were involved. Who in some legends were ''also'' Leah and Rachel's sisters.
** In the biblical fiction book ''Literature/TheRedTent'', about Jacob and Leah's daughter Dinah, this is one of the main plot points. Jacob loves Rachel but also loves Leah. This is further complicated by the book saying that the handmaidens (Bilhah and Zilpah) are their sisters. Which is true in some Jewish lore as well.
* In the Creator/IsaacAsimov short story ''To Your Health'', two brother opticians are in love with the same eye-fixated girl.
* ''Literature/MansfieldPark'' by Jane Austen has a LoveDodecahedron, but one Sibling Triangle is a vital part. The Bertram sisters Maria and Julia both go after Henry Crawford (despite Maria Bertram already being engaged). Crawford plays with their hearts for his own amusement (and seems to prefer the engaged Maria) until their DisappearedDad returns home. Then he pulls back and doesn't propose to either of them. Both sisters are hurt and bitter, and it damaged their rather good sisterly relationship. [[spoiler: Much later Crawford runs away with now ''married'' Maria, they live together for a while, and then he leaves her. His reputation is more or less fine, but she is a ruined woman and a social pariah for life.]]
* ''Literature/{{Persuasion}}'':
** Henrietta and Louisa Musgrove are crazy about Captain Wentworth who flirts with both. Louisa then manoeuvres Henrietta away to her original suitor and seems to have Wentworth for herself, but he ends up with neither Musgrove girl.
** There are sisters Elizabeth and Anne Elliot and their potential marriages to their distant cousin William Elliot who is their father's heir. Elizabeth would love to marry him very badly, but he does not see her as a wife material, but she continues to see his politeness and friendly air as courtship. He would like to marry her sister Anne who is interested in him at first and for a brief moment likes the idea of becoming the next Lady Elliot, but does not trust him and does not love him. He ends up with neither of them [[spoiler:as Mrs Clay becomes his mistress and they settle together]], Elizabeth remains single and Anne gets married to her one true love.
* ''Literature/TheDemonsLexicon''.
** Before the start of the series, Nick and Sin had a casual relationship that he ended. In the beginning of the third book Nick seems to enjoy Sin's company and his brother Alan bribes her to spend time with Nick. The 'triangle' bit kicks in when [[spoiler: Sin and Alan begin to fall for each other and ultimately become a couple]].
** Spanning all three books is the one Nick and Alan have with Mae. They're both attracted to her and she's attracted to both of them.
** Mae gets another one with Seb and her brother Jamie. She briefly dates Seb before finding out [[spoiler: that he's gay, in love with Jamie, and using her as TheBeard and excuse to be around him.]] Jamie dislikes Mae dating Seb because [[spoiler: Seb bullied Jamie and mocked Jamie for staring at him when they first met. This prevented their classmates from becoming suspicious of Seb's own sexuality and effectively ruined Jamie's social life. Jamie resented Seb for that, but still winds up with him in the end.]]
* A dark version in the backstory to ''[[Literature/TheSwordOfShannaraTrilogy The Elfstones of Shannara]]''. [[WickedWitch The Witch Sisters]], Morag & Mallenroh, both fell in love with a human. Given that they're a pair of SelfishEvil {{Yandere}} sociopaths, this ended with him dead, and each of them [[NeverMyFault blaming the other one]].
* ''Literature/EastOfEden'' (which is, after all, based on Literature/TheBible), has ''two'' of these. [[spoiler:Cathy marries Adam after sleeping with his brother Charles]]. Later, [[spoiler:Cathy's sons Cal and Aron like the same girl, Abra. She's interested in Aron when they're children, but their relationship becomes strained in high school, and she switches to Cal toward the end of the book]].
* In the backstory of ''Literature/EightCousins'', a woman named Rose was courted by the brothers George and Alec Campbell. She chose George and married him, but at the cost of the distancement between George and and Alec. Sadly, Rose died early in her life, and some years later George perished as well; in George's deathbed, the brothers were reconciled, and Alec promised the dying George to take care of his and Rose's daughter, Rose Jr. aka the female lead of the story.
* In ''Literature/OneHundredYearsOfSolitude'', HookerwithAHeartOfGold Petra Cotes regularly sleeps with the twins Jose Arcadio Segundo and Aureliano Segundo without realizing they're not the same dude. The three contract a STD, which reveals the whole deal, and she breaks up with them. Jose Arcadio Segundo leaves Petra after getting better, but Aureliano Segundo gets her forgiveness and keeps her as TheMistress since he cannot marry her.
* In the ''Literature/LowlandsOfScotland'' series, sisters Rose and Leona both fall for [[KissingCousins their cousin]] Jamie after he arrives at their father's home. However, Jamie only has eyes for Rose, until he [[BrideAndSwitch accidentally ends up married to Leona]] and learns to love her. And then when Rose's machinations work and he is broken up from Leona and married to Rose, he has to learn to love Rose all over again. And the sisters have to work through both of them loving and having been married to the same man.
* Actually ''averted'' in ''Literature/LittleWomen''. Laurie only fell for Jo's younger sister Amy ''after being rejected at least twice by Jo herself'', and later they both see they're much better in a LikeBrotherAndSister relationship. [[DieForOurShip The fandom still acts as if Amy was a slut who deliberately stole "Jo's True Love".]]
* Also averted in Literature/EvaLuna. Rolf Carle is smitten with both of his cute [[KissingCousins cousins]] and cannot decide who to choose since both girls are appealing to him [[TomboyandgirlyGirl in their own ways]]. The girls talk about this and they decide to... [[OneTrueThreesome share his body and affection]] and tackle him together when he's working in the garden. They keep this relationship for several years, until the girls marry local guys and Rolf becomes an IntrepidReporter; nevertheless, they always remember these times very fondly.
* Played with in ''Literature/TheInfernalDevices''. Though the main character, Tessa's, love interests are not biological brothers, they are parabati, which for Shadowhunters is quite close to being brothers. There isn't a 'Mundane' equivalent for it.
* ''Literature/ASongOfIceAndFire'':
** In the distant backstory, in accordance with Valyrian tradition, Aegon Targaryen (later known as [[FounderOfTheKingdom Aegon the Conqueror]]) was [[ArrangedMarriage required]] by his parents to marry his [[BrotherSisterIncest older sister]] Visenya, but he was in love with his younger sister Rhaenys. His solution was to [[MarryThemAll marry both of them]], which was unusual, but allowed. Understandably, Visenya was not happy about having to share a husband with her sister, especially since Aegon favoured Rhaenys and named their son Aenys as his heir instead of Visenya's son Maegor, who was much more martial and warrior-like. She's widely thought to have gotten got her revenge ([[RevengeByProxy sort-of]]) long after her siblings' deaths, when she poisoned her [[EvilStepmother stepson]]/[[EvilAunt nephew]] when he sought refuge with her and [[MotherMakesYouKing installed]] Maegor on the throne after Aenys's death. Eventually she lost out when Maegor died without issue and the throne passed to Rhaenys' son Jaehaerys, and all Targaryen kings since then were descended from Rhaenys.
** More recently in the backstory, there's a particularly tragic example between Lysa and Catelyn Tully, and Petyr Baelish. [[AllLoveIsUnrequited Lysa was in love with Petyr, Petyr was in love with Catelyn, Catelyn saw him as a little brother]]. [[spoiler:This leads to a continent-spanning civil war and thousands of deaths, including those of both Lysa and Catelyn.]]
* Chloe from ''Literature/DarkestPowers'' is stuck between a love triangle involving the foster brothers Derek and Simon. [[spoiler:[[OfficialCouple She chooses Derek]].]]
* In ''Literature/TheStainlessSteelRat'', Jim's twin sons James and Bolivar fall for the same young female agent. And she falls for both of them too, unable to decide between them. Fortunately, the triangle is resolved by the discovery of an alternate universe, which seems to double any signal sent to it, which includes physical objects. The woman ends up not only twinning herself, but the two identical copies share a HiveMind. In later books, this serves as a useful method of instantaneous communication across light years.
* In 'As I Darken', Lada, her slightly younger brother Radu, and Mehmed, son of the sultan, become friends as children. When Lada and Mehmed grow older they fall in love and start a relationship, which makes Radu realize that he is also in love with Mehmed. Lada finds out and their relationship has a lot of tension, especially after Radu suggests to her that it would be weak to stay with Mehmed, knowing full well that that's the thing to say to get her to leave.

[[folder:Live-Action TV]]
* ''Series/ArrestedDevelopment'' played with this. Michael develops feelings for Marta who is with GOB. GOB is mostly using her but he doesn't want Michael to have her either. Also Buster has a crush on Marta. All three of them are rebuffed by Marta eventually.
** Later there's a RunningGag of GOB trying to seduce women that Michael likes, but repeatedly getting the wrong woman. (For instance, when Michael is dating his son's ethics teacher, GOB ends up seducing a different teacher by mistake.)
* Tommy and Justin of ''Series/BrothersAndSisters'' were both dating Lena, though not precisely at the same time.
* An episode of ''Series/LittleHouseOnThePrairie'' has Laura with a crush on an older boy, who has a crush on Mary (Laura's older sister).
* ''Series/WizardsOfWaverlyPlace'': Due to Tutor's being part elf, Justin and Alex fight over her like this. While Alex's fighting for her is [[RomanticTwoGirlFriendship supposed to be platonic]] it has been taken in [[LesYay other ways]].
* In the British thriller series ''Series/TheLastEnemy'', Stephen and Yasim start a relationship with each other after her husband (his brother) dies in a car bomb. Then the brother [[FakingTheDead comes back]].
* ''Series/TheVampireDiaries'' brings us Damon and Stefan Salvatore who became vampires after falling in love with Katherine, a vampire that abuses their love triangle. After she is seemingly killed the brothers eventually end up in Mystic Falls where they both fall in love with Elena, who looks exactly like Katherine.
** And in the past, Klaus and Elijah over Katherine.
** Klaus reveals that he and Elijah fell in love with the same girl - Elena and Katherine's ultimate ancestor - when they were still human. It was her blood that they unknowingly consumed when their mother turned them into vampires, which explains the need for the doppelganger. (Katherine is the first doppelganger and Elena is the second).
** While they aren't siblings Elena/Stefan/Katherine kinda counts considering that Katherine is Elena's great-something grandmother. Try not to think about that one too hard.
* One episode of ''Series/TheSecretWorldOfAlexMack'' has Alex get a crush on a boy, who she later finds out is dating her sister. She [[IWantMyBelovedToBeHappy tries to keep him from breaking up with Annie]], and when he does anyway, she refuses to date him because he dumped her sister for her.
* Probably happened more than once on ''Series/DegrassiTheNextGeneration'', but Adam and his brother Drew fought over Fiona, before Drew bowed out.
** A weirder example is the Declan/Holly J/Fiona triangle. Because they moved around a lot Declan and Fiona were very close but after [[LadykillerInLove Declan]] fell for [[DefrostingIceQueen Holly J]], [[ClingyJealousGirl Fiona]] did everything she could to try to drive Holly J away including [[BrotherSisterIncest kissing her brother at a party]]. After getting therapy, Fiona became good friends with Holly J eventually realized she’s a lesbian and was in love with Holly J.
* One episode of ''Series/{{Roseanne}}'' has Mark almost take a girl out on a date just because his younger brother David wanted to. His JerkAss-ery is repaid when his ''wife'' almost finds out, and David, after helping him hide it from her, [[ArmorPiercingQuestion asks Mark]] if he really wants to alienate the only two people who really care about him.
** Interestingly, earlier in that season there were hints of a love triangle over Becky (the aforementioned wife), but [[AbortedArc it abruptly stopped]] after two episodes.
* In ''Series/{{Jonas}}'', the brothers fight over a pizza delivery girl.
* One episode of ''Series/SisterSister'' has a guy accidentally ask identical twins Tia and Tamara out on a date because he couldn't tell them apart. The three go on a rather awkward date together [[HilarityEnsues when he comes over]] and the mistake is realized. Both also liked Roger after [[SheIsAllGrownUp he suddenly becomes hotter]], and he winds up dating each of them at some point.
* In an episode of ''Series/{{Frasier}}'', Frasier and Niles ''think'' they're participating in this trope as they compete for the affections of a certain woman at a party, but they realize they've been talking about two ''different'' women all night...right after they decide their sibling bond is more important than a random woman, let the object(s) of their affections leave the party without propositioning them. Cue double OhCrap expressions.
* In ''Series/TheBorgias'', thirteen-year-old Joffre Borgia marries FemmeFatale Sancia, who has a torrid affair with his elder brother Juan. Incidentally, Juan was supposed to be the one marrying Sancia in the first place but he refused on the grounds that she's a mere RoyalBastard, (despite the fact that [[{{Hypocrite}} he's infamously illigitimate himself]] what with being the son of the Pope and all) but he doesn't mind having sex with her literally ''seconds'' before she consummates her marriage with poor [[ObliviousYoungerSibling Joffre]]. Also, while the show hasn't had time to portray this yet, historically Sancia later had an affair with the eldest Borgia sibling Cesare, making it a sibling love ''square'' (this situation is sometimes cited as the reason for [[spoiler: [[CainAndAbel Juan's eventual murder at the hand of Cesare]].]]) Yeah. The term BigScrewedUpFamily barely even covers it. Particularly when you factor in the various Sibling Triangles engendered by Cesare and Lucrezia’s [[BrotherSisterIncest incestuous]] relationship (whether the show will actually go there remains to be seen, but so far the IncestSubtext is hardly subtle). Cesare threatened to murder her first husband Giovanni [[IfYouEverDoAnythingToHurtHer if he ever hurt her]], and he [[spoiler: allegedly DID murder her second husband Alfonso (Sancia’s brother) purely out of jealousy]].
* Wataru, Taiga and Mio in ''Series/KamenRiderKiva'', though Wataru and Taiga initially do not know they are brothers.
* On ''Series/MurdochMysteries'', Detective William Murdoch and [[TheCoroner Dr.]] Julia Ogden have the cutest WillTheyOrWontThey [[UnresolvedSexualTension tension]]. In the episode "Houdini Whodunit", Julia's [[AnnoyingYoungerSibling younger sister]] Rugy appears and flirts with Murdoch immensely daringly, and even invites him for romantic dinner, which is quite a big deal for the Victorian times. However, Julia doesn't give up: When she comes to the restaurant to discuss the case (originally unaware that ''they'' are there together), she seems hurt by seeing them, but she ultimately decides to join them and fight. Understandably, Ruby is irritated, but when she sees how serious Julia is about the Detective, she starts supporting her and becomes their ShipperOnDeck.
* On ''Series/{{Grimm}}'', the Renard half-brothers have both had involvements with Adalind [[spoiler:and it's currently uncertain which, if either, is the father of her unborn child. She may not even be all that sure about that point herself]].
* ''Series/TheBradyBunch'' episode "Cyrano de Brady" has Peter pining for a friend of Jan's and asks for Greg's help in wooing her. Unfortunately, the girl thinks it's the other way around and throws herself at Greg, pissing Peter off and leaving Greg with an unwanted admirer. Fortunately the triangle works in Peter's favor in the end.
** A smaller one occurs in "The Not-So-Ugly Duckling", when a boy Jan likes drools over Marcia. However, Marcia has zero interest in the boy, despite Jan's accusations of boyfriend-stealing.
* In ''Series/{{Helix}}'', Julia, a CDC researcher, became unhappy in her marriage to coworker Alan and turned to his younger brother Peter, a research scientist, for comfort. After Alan caught them in bed together, Julia divorced Alan and totally cut off contact with Peter. In the present, both brothers carry a torch for Julia, while Julia struggles with unhappy memories of her marriage to Alan and still-present feelings for Peter, all in the midst of an outbreak of TheVirus at a ResearchInc, which Alan and Julia have been sent to contain, with Peter as the PatientZero.
* ''Series/{{Arrow}}'' has the Lance sisters, Sarah and Laurel who competed, rather bitterly, for Olliver's affections. Sara being on the boat with Olliver has shades of revenge and spite for Laurel.
* In the ''Series/{{CSI}}'' episode "Exile", two sisters loved the same man who had been [[ChildhoodFriendRomance a childhood friend]], but he only reciprocated the feelings of one. The episode begins with one sister's body being discovered and it goes downhill from there.
* One episode of ''Series/LivingSingle'' had Regine seeing both an older gentleman and his son, Played by real-life father-son duo Melvin and Mario Van Peebles.
* In the fourth season of ''Series/FallingSkies'', Ben falls for his older brother's girlfriend Maggie. It blossoms into a full-fledged love triangle when some of Ben's spikes are transplanted to Maggie in a last-ditch effort to save her life, creating a connection between the two of them.
* During the mid-90's on ''Series/GeneralHospital'', both AJ and Jason Quartermaine fell in LoveAtFirstSight with Keesha Ward, with Jason being the one lucky enough to snag her. This didn't stop AJ from continuing to lust after Keesha and trying to find ways to undermine the relationship.
* Also frequently done on ''Series/TheBoldAndTheBeautiful''--Ridge and Thorne battled over Caroline and later Taylor, Brooke and Katie battled over Bill. In fact, there's too many SoapOpera examples to cite.
* PlayedWith in ''{{Series/Supergirl}}''--teenage Carter has a PrecociousCrush on Supergirl while his older half-brother, Adam, briefly dates Kara.
* In ''Series/OneTreeHill'', Lucas and Nathan Scott both want to date Peyton throughout a large portion of the first season. However, it is not treated as a sibling-triangle [[InUniverse in-universe]], because the two are half-brothers who were not raised together and spend much of the same arc as rivals. When the two finally decide to become friends and acknowledge each other at brothers, they also stop competing for the same girl with Lucas dating Peyton and Nathan dating [[OneTruePairing Haley]].
* Played with on the ''Series/BuffyTheVampireSlayer'' episode ''Him,'' when both Dawn and Buffy fall under a certain boy's [[LovePotion love spell]] They fight over him. A lot. And then the triangle expands into a pentagon, when both Anya and Willow ([[IfItsYouItsOkay yes, her too]]) fall under the spell too.
* PlayedForLaughs in ''Series/NCISLosAngeles'' when Kensi sabotages Deeks' attempt to use her as his unwilling wingman to pick up some women exercising in a park. She yells at him that she's not leaving him because of his job (as he claims), she's leaving him because he cheated on her with her ''brother''.
* In the ''Series/{{Voyagers}}'' pilot "[[Recap/VoyagersS1E1Voyagers Voyagers]]", Bogg and Jeffrey find out the reason that airplanes have disappeared from the time stream is that the Wright Brothers fell out over a girl called Agnes. Jeffrey is baffled over how something that big could happen because of a girl. Bogg, amused, informs him that wars have happened over girls.
* In the ''Series/OnlyFoolsAndHorses'' episode "Tea for Three" had Del and Rodney feuding over Trigger's niece, despite Uncle Albert warning them that this is exactly what caused the rift between him and Grandad. A couple of {{Zany Scheme}}s later, it all ended with [[ItMakesSenseInContext Rodney sunburnt and Del in a hang-gliding accident]]. And it turns out Lisa's already engaged anyway.

* In the folk song "William and Davy", twins William and Davy fight bitterly over the woman they're both in love with... who, as it turns out, isn't interested in either of them.

[[folder:Pro Wrestling]]
* On ''Wrestling/WWESmackdown'', Primo Colon started dating the "mysterious" Brie Bella, only for her to reject him out of the blue and start showing interest in his brother Wrestling/{{Carlito|Colon}}. [[Wrestling/LisaMarieVaron Victoria]] and Wrestling/{{Natalya|Neidhart}} would expose Brie's hidden twin sister, explaining this erratic behavior. Rather than get angry, the brothers ended up going on double dates with the sisters.
* At the end of November 2010, both of Wrestling/BellaTwins started going after Wrestling/DanielBryan in ''Wrestling/WWERaw'', with this trope being the inevitable result.

[[folder:Tabletop Games]]
* This forms a large part of Strahd von Zarovich's backstory in the ''TabletopGame/{{Ravenloft}}'' setting of ''TabletopGame/DungeonsAndDragons'', and recounted in the book ''I, Strahd''. He and his brother Sergei both ended up falling for a woman named Tatyana, but Tatyana chose the younger Sergei and Strahd decided to make a literal DealWithTheDevil in exchange for restored youth and power and killed Sergei himself on the day of his wedding to Tatyana. When he tried to woo Tatyana, however, she again rejected him and [[DrivenToSuicide threw herself from the top of Castle Ravenloft to her death]].

* Verdi's ''Theatre/IlTrovatore''. And the boys don't even know they're brothers. Consequence? Well, it's an opera...
* Other operatic examples include ''Pelléas et Mélisande'' by Debussy (based on Maeterlink's play), and ''Amadis'' by Jules Massenet.
* A variation exists in ''The Love of the Nightingale''. Tereus has an ArrangedMarriage to Procne but falls for her sister Philomele. However neither even likes him.
* This is basically the plot of "The Bartered Bride", the opera by Bedrich Smetana. Marenka and Jenik want to get married, but Marenka's parents have already employed a matchmaker to hook her up with the son of a rich man named Micha. The matchmaker demands Jenik break up with Marenka, and Jenik promises he will do so if the matchmaker pays him off and promises that Marenka won't marry anyone else but Micha's son. Jenik, of course, turns out to be Micha's long-lost son, and he and Marenka get married.
* A major plot point in BloodBrothers is both Mickey and Eddie being in love with Linda. However none of the three know that Mickey and Eddie are brothers.
* In ''Theatre/{{Hamlet}}'', Claudius murders his brother Hamlet Sr. and marries his brother's wife Gertrude a month later. It's heavily implied that she herself was in on the plot.
* ''Les Jumeaux de la Réole'', a play about twin French generals César and Constantin Faucher, briefly features this: César is in love with Eudoxie, their colonel's younger sister, and she is in love with Constantin. In the end, it is César who marries Eudoxie.
* In Theatre/{{Hamilton}}, sisters [[SpiritedYoungLady Angelica]] and [[ProperLady Eliza]] are both in love with Alexander, but Angelica puts her romantic feelings aside because she cares about her sister's happiness above all else.
* [[ComicStrip/{{Peanuts}} Beethoven, CB, and CB's sister]] in ''Theater/DogSeesGod''.

[[folder:Video Games]]
* In the VideoGame/{{Warcraft}} universe, Night Elf brothers Malfurion and Illidan Stormrage both vie for Tyrande Whisperwind's affections. Illidan's rage and jealousy towards Malfurion for so effortlessly (and unintentionally) winning Tyrande's affections played a large part in triggering Illidan's FaceHeelTurn.
** And in ''Frozen Throne'' it's revealed that he still cares for her; the news of her being dead (not really) triggers a HeelFaceTurn where Illidan [[IWantMyBelovedToBeHappy fetches her, gives her back to Malfurion then leaves their lives for good]].
* In ''VideoGame/DiabloIII'' Lyndon the Scoundrel and his brother Edlin both fell in love with a woman named Rea. Rea eventually chose Edlin, who was himself unaware of Lyndon's love for her. The relationship was further complicated when Edlin botched his the scam he was running with Lyndon and ended up in jail, after which Rea became convinced Lyndon had set it up to get her.
* In ''VideoGame/Persona2: Eternal Punishment'', Tatsuya and Katsuya are both in love with Maya. Katsuya's [[EnemyWithout Shadow]] taunts him with this and uses it to try to get him to [[MurderTheHypotenuse shoot Tatsuya]]. [[spoiler:Katsuya says that while the Shadow is right about his feelings, he loves his brother anyway, and shoots the Shadow instead.]]
* In ''VideoGame/DragonAgeII'', [[PlayerCharacter Hawke's]] younger brother Carver cautiously tries to win the affection of Merrill, one of Hawke's possible love interests. He does not succeed, as Merrill seemingly doesn't notice, but if Hawke and Merrill become a couple, in a later PartyBanter Carver bitterly comments "So, you and Merrill.", to which an aggressive Hawke replies "Yes. I and Merrill". A similar situation can arise regarding Hawke's sister Bethany and Sebastian, but it is less severe, as Bethany and Sebastian don't spend much time in the party together.
** Also [[FridgeBrilliance implied]] that Merrill knows exactly where Carver's trying to go, but is [[ObfuscatingStupidity feigning obliviousness]] to let him down gently, since she's got a massive crush on Hawke.
** Carver also shares a mutual attraction with Isabela, which leads to a funny reaction from Hawke when Isabela gets turned on by Carver's flirtation.
* In the backstory of ''VisualNovel/SymphonicRain'', both [[SiblingYinYang Arietta and Torta Fine]] were in love with Chris and despite everyone saying Torta complimented him, he ended up getting together with Arietta.
* In Taketo's route of ''VisualNovel/ClassTripCrush'', Taketo and the protagonist are well on their way to falling for one another when the protagonist finds herself hitting it off with Taketo's twin brother Yasuto... who quickly starts to fall for her as well. Confusion, awkwardness, and hurt feelings soon abound.
* In the original ''[[VideoGame/DoubleDragonI Double Dragon]]'', Jimmy Lee is in love with brother's girlfriend, Marian, who gets kidnapped by the Black Warriors. If two players defeat the final boss together, Billy will challenge Jimmy over Marian.
* In ''Theatre/BeyondTheHorizon'' Ruth, who was betrothed to Andrew, picks his brother Robert instead. All three live to regret it, as Ruth realizes pretty soon that she actually did love Andrew, and her marriage to Robert descends into hatred and bitterness.

[[folder:Visual Novels]]
* A common variation of this common in Otome Games is to have a ThemedHarem [[UpToEleven around this]] for those who want siblings. but no BrotherSisterIncest (although in ''LightNovel/BrothersConflict'''s case it's NotBloodSiblings[[spoiler:...[[ObliviousAdoption twice]]]]). Other examples include:
** ''AudioPlay/DiabolikLovers''
** ''Anime/DanceWithDevils''
* The twins Ryou and Kyou in ''VisualNovel/{{CLANNAD}}'' both like Tomoya, who is friends with Kyou but barely knows Ryou. Seeing that she can't get close to him on her own, she enlists her sister knowing how she feels. After a brief fuss, Tomoya agrees to go out with her, only to realize a week later that he doesn't actually like her and probably never will. He manages to deny it to himself for awhile but after awhile it just becomes impossible and he admits that he likes Kyou. Ryou, knowing the score, desperately tries to cling on to him by acting more like her sister. She can't do it because this is the Kyou route. You ''can'' get a Ryou ending by making the wrong choices, but you don't get a proper ending and the relationship is just as shallow and unlikely to last as it is in the Kyou route.
* The twins Itsuki and Sayo both fall in love with Akira in ''VisualNovel/{{Suika}}''. It ends when [[spoiler:right before Akira has to move away, they have a fight over who gets to give him the present they made for him. Itsuki [[StaircaseTumble pushes Sayo down the stairs]] and thinks she's killed her, before REALLY getting killed by her insane father. The Itsuki we meet later is actually DeadAllAlong, while Sayo is hospitalised and in a coma.]]
* In ''VisualNovel/UnderTheMoon'', twin brothers (of course twins) Leni and Seizh are both madly in love with the heroine, Ashe. Emphasis on the "mad" part. [[CainAndAbel There's a distinct possibility that they'll kill each other over her]].
* In ''VisualNovel/HigurashiWhenTheyCry'', At first Shion seems to like the same boy as her identical twin sister Mion, but she subverts it since it's later shown she was simply [[TheGadfly teasing]] and is actually in love with Satoko's brother Satoshi, who disappeared under mysterious circumstances. Depending on the route, sometimes she [[ShipperOnDeck encourages Keiichi and Mion]] to get together, and sometimes [[ShippingTorpedo she sabotages their relationship out of jealousy]]. Like everyone in that story, [[ThereAreNoTherapists she has issues]].
* In ''VisualNovel/{{Tsukihime}}'' the {{Meido}} twins Kohaku and Hisui are both potential love interests for the main character Shiki, but on different routes. A key part of their story involves the fact that they both knew Shiki when he was a kid, [[spoiler:but Shiki doesn't realize the two pulled a TwinSwitch and that the GenkiGirl was really Hisui while the sad girl in the window was Kohaku, the opposite of their current dispositions]].
* In ''VisualNovel/LiarLiar'' it's revealed that Yukari is out to kill her (technically ex) boyfriend because [[spoiler:he confessed to her little sister Minami. He ended up two-timing them before breaking up with Yukari to be with Minami.]]
* Happens at times in the ''VisualNovel/ShallWeDate'' visual novels:
** In ''VisualNovel/ShallWeDateMySweetPrince'', the heroine has to choose which brother she thinks is fit to be king. And she has to choose among ''six'' brothers. Cue wacky hijinks and SiblingRivalry, especially between Alvah and Jun.
** In ''[[VisualNovel/ShallWeDateNinjaShadow Shall We Date?: Ninja Shadow]]'', there can be one between the PlayerCharacter Saori and [[spoiler: the Nakagawa brothers, [[ReasonableAuthorityFigure Makoto]] and [[WellIntentionedExtremist Toru]].]] Both brothers have their separate routes.

[[folder:Web Comics]]
* Da-Jeong in ''Webcomic/TheFriendlyWinter'' has feelings for a local boy who doesn't like her back, or even know that she's [[OlderThanTheyLook nineteen, not nine]]. It turns out he has a girlfriend--who is unknowingly her younger step-sister on her mother's side. Da-Jeong's mother [[ParentalAbandonment walked out on her family]] ten years ago, due to her daughter's disorder, and they haven't seen each other since.

[[folder:Web Video]]
* Spoofed by Website/YouTube contributor Ben Loka in his video "Never Trust A Sat Nav". After his argument with the Sat-Nav turns into a lover's spat, Ben reveals he's cheating on it with someone the Sat-Nav identifies as her sister: a road atlas.

[[folder:Western Animation]]
* Semi-example: In one episode of ''[[WesternAnimation/TeenageMutantNinjaTurtles1987 Teenage Mutant Ninja Turtles]]'', three of the four Turtles eat pizza tainted with a love potion, causing those three to fall in love with Irma. Hilarity and in-fighting ensue, until Splinter and the unaffected Turtle, [[TheSmartGuy Donatello]], find a way to counteract the potion. Afterwards, further hilarity ensues when Irma discovers who was actually courting her.
* PlayedForLaughs on ''WesternAnimation/PhineasAndFerb,'' when [[FailureIsTheOnlyOption Candace]]'s KidFromTheFuture refers to [[TheChick Isabella]] as her aunt.
-->'''Isabella:''' 'Aunt Isabella!' That means I'm [[VictoriousChildhoodFriend going to marry Phineas]]!
-->'''Candace:''' Or Ferb.
-->''(Isabella looks shocked as [[CovertPervert Ferb]] suddenly turns around [[ShipTease and winks at her]])''
** It's also been hinted in different episodes that both [[LoonyFan Irving]] and [[AloofBigBrother Albert]] have a thing for [[JerkWithAHeartOfGold Candace]]. This doesn't make much of a difference, though, since she [[SingleTargetSexuality only has eyes]] [[OfficialCouple for]] [[SingleWomanSeeksGoodMan Jeremy]].
* In one episode of ''WesternAnimation/UglyAmericans,'' Callie gets a little sister, Lillith, who plans to kill Callie and have sex with her boyfriend, Mark, most likely [[DoubleStandardRapeFemaleOnMale against his will]]. Made even weirder because [[NotBloodSiblings Mark and Callie had raised her since she was a toddler]] ([[RapidAging two weeks before]]).
* ''[[WesternAnimation/{{Thundercats 2011}} [=ThunderCats (2011)=]]]'' establishes a triangle between adoptive siblings Lion-O and Tygra and their bodyguard[=/=]priest Cheetara, with Cheetara unaware that the brothers are jockeying for her favor behind her back. It's later [[TheReveal revealed]] that [[ChildhoodFriendRomance Tygra and Cheetara were friends as kids]], which is why Tygra took an interest in her [[spoiler: Cheetara ends up choosing Tygra -- and in fact she had loved him for a while already, only that [[LovedINotHonorMore her duty was her first priority]].]].
* In Season 1 of ''WesternAnimation/TheLegendOfKorra,'' [[DoggedNiceGuy Bolin]] has a crush on [[ActionGirl Korra]], while she has a crush on his older brother [[TallDarkAndSnarky Mako]], who [[BelligerentSexualTension likes her back but has trouble admitting it]]. For added confusion, Mako is dating another character, [[UptownGirl Asami]]. Ultimately, Mako and Korra hook up, [[spoiler:until the end of season 2, when they decide to break up and stay as JustFriends.]] Meanwhile, Bolin moves on with two new love interests, first [[{{Yandere}} Eska]] (who happens to be Korra's cousin), and then [[LastGirlWins Opal]].
* Happens in ''{{WesternAnimation/Gargoyles}},'' though this is an odd example since all gargoyles of the same clan and generation consider themselves siblings. Still, [[AllThereInTheScript "Othello" and "Iago"]] refer to each other this way as they fight over the former's mate, and all three members of the Trio compete over [[AffirmativeActionGirl Angela]] when she first arrives.
* On ''WesternAnimation/{{Daria}}'' both of [[AlphaBitch Sandi]]'s younger brothers have a {{Precocious Crush}} on [[LovableAlphaBitch Quinn]].
* ''WesternAnimation/AnnaAndBella'': A wedge is driven between the two sisters for the first time when the young man that Anna is sweet on winds up going out with Bella.