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* ''Film/SwampThing'': When Cable meets doctors Linda and Alec Holland, she's impressed by Alec's charm and brilliance, but when he takes her out on a tour of the swamp and starts hitting on her shamelessly, she angrily spurns him, saying, "Save it for your wife!" Upon their return to the lab, Linda makes an offhand reference to hers and Alec's father, revealing that they're siblings. Cable immediately starts treating Alec more warmly.
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* ''Film/SwampThing'': ''Film/SwampThing1982'': When Cable meets doctors Linda and Alec Holland, she's impressed by Alec's charm and brilliance, but when he takes her out on a tour of the swamp and starts hitting on her shamelessly, she angrily spurns him, saying, "Save it for your wife!" Upon their return to the lab, Linda makes an offhand reference to hers and Alec's father, revealing that they're siblings. Cable immediately starts treating Alec more warmly.
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* ''Film/{{Buffaloed}}'': Graham sees Peg and JJ roughhousing at the bar and calls the cops, assuming it to be a "spousal altercation". They have to clarify that they are sister and brother.
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* In ''Film/HobbsAndShaw'', Deckard Shaw catches Luke Hobbs fighting Shaw's sister Hattie and [[BigBrotherInstinct furiously demands he get his hands off her]], causing Hobbs to think she's his girlfriend. This naturally [[{{Squick}} squicks]] both of them.
-->'''Hobbs:''' [[SarcasmMode Bullshit! She's too good-looking to be your sister.]]
-->'''Hobbs:''' [[SarcasmMode Bullshit! She's too good-looking to be your sister.]]
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* ''Film/SwampThing'': When Cable meets doctors Linda and Alec Holland, she's impressed by Alec's charm and brilliance, but when he takes her out on a tour of the swamp and starts hitting on her shamelessly, she angrily spurns him, saying, "Save it for your wife!" Upon their return to the lab, Linda makes an offhand reference to hers and Alec's father, revealing that they're siblings. Cable immediately starts treating Alec more warmly.
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* ''Film/TheHoliday'': Amanda accidentally sees the names "Sophie" and "Olivia" on Graham's cellphone and assumes they're two other women he's also dating. When she goes over to his house one night she learns that Sophie and Olivia are actually his daughters by his [[RomancingTheWidow late wife]].
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* ''Film/{{Doom}}'': The team of marines has a John Grimm. They meet a HotScientist named Sam Grimm and she and John clearly know each other. John's teammates assume she is his ex-wife until he explains she is his sister.
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* ''Film/{{Doom}}'': The team of marines has a John Grimm. They meet a HotScientist scientist named Sam Grimm and she and John clearly know each other. John's teammates assume she is his ex-wife until he explains she is his sister.
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%% This page has been alphabetized. Please add new examples in the correct order. Thanks!
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'''Warning:''' Spoilers Ahead.
[[RelativeError Relatives getting mistaken for]] {{Love Interest}}s in LiveActionFilms.
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* Inverted in ''Film/AfterTheDark'' where it's mentioned that [[StraightGay Jack]] once brought his boyfriend to a party and people thought they were cousins.
* In ''Film/ArchieToRiverdaleAndBackAgain'', Jughead's son gets mistaken for Archie's son by his teachers at their high school reunion.
* In ''Film/{{Bugsy}}'', Bugsy Siegel threatens to beat up a man with his pants off in his girlfriend's house. She's mending a hole in her brother's pants pocket.
* In ''Film/TheDilemma'', Ronny mistakes a man talking to his girlfriend as trying to feel her up. But when he confronts them, Ronny's girlfriend says that the man is actually her cousin -- and he's also gay.
* ''Film/{{Doom}}'': The team of marines has a John Grimm. They meet a HotScientist named Sam Grimm and she and John clearly know each other. John's teammates assume she is his ex-wife until he explains she is his sister.
* In the 2009 film ''Film/DorianGray'', when Dorian introduces himself to Sybil Vane for the first time, he says he saw her previously in a gin tavern but was unable to talk to her because she'd left with another man. He's noticeably uncomfortable, assuming the man was her lover until she says that the man she left with was "Jim... my brother."
* ''Film/GMen'': When Brick, who has become attracted to Kay, sees her kissing Jeff (his boss), he's unhappy at first, but when he learns Kay is Jeff's sister, he smiles.
* The plot catalyst in ''Film/GrayMatters''. [[spoiler:The brother-and-sister team both kiss the same woman, too.]]
* ''Film/KullTheConqueror'': Kull assumes Ascalante to be Zareta's lover since he's so keen on rescuing her. When he asks Zareta directly about their relation to each other, she reveals that Ascalante is her brother. She later becomes Kull's lover, and Ascalante is totally fine with that.
* In ''Film/LettersToJuliet'', this causes Sophie some grief when Charlie introduces her to a woman named Patricia, who Sophie initially assumes is the ex-girlfriend he had mentioned earlier in the film. [[spoiler: It turns out that the Patricia who Charlie was introducing Sophie to was actually his cousin, who just happens to have the same first name as the ex-girlfriend he had previously mentioned.]]
* Inverted in the Creator/WinonaRyder film adaptation of ''Literature/LittleWomen''. A suitor of Jo's calls at the house, where Hannah the housekeeper mistakes him for a European friend of Amy's and informs him that "Miss March and Mr. Laurie are livin' next door". Friedrich takes this to mean that Jo has married her old friend Laurie, but Jo hurries down the road after him to explain that it's her sister who is married.
* ''Film/MabelsBlunder'': Mabel sees her boyfriend embracing a woman and gets the wrong idea. It was his sister, and it was an innocent hug. But slapstick hijinx ensue nonetheless.
* In ''Film/MysticPizza'', Daisy is outside a country club with Kat and Jojo when she sees Charlie, her boyfriend, inside with a beautiful woman. In a rage, Daisy [[ItMakesSenseInContext pours two barrels of fish into his car]]. Then Charlie introduces the woman (named Serena) as his ''sister''.
-->'''Daisy:''' ''[crying]'' I fucked up.\\
'''Charlie:''' Yeah, but you gave it 100% effort.
* In ''Film/{{Parasite|2019}}'', the Parks' daughter Da-hye notices that her English tutor Ki-woo is more familiar with her little brother's art teacher Ki-jeong than he should be. He'd told the Parks that she was a friend of his cousin's. She thinks they're dating but they're actually siblings.
* The French movie ''Qu'est-ce qu'on a fait au Bon Dieu'' uses this early on. An upper-class, white Catholic family has four daughters, three of whom have married an Algerian Muslim, a Sephardic Jew, and a Chinese Taoist. The final daughter is in a relationship with a Catholic... who's black. The three brothers-in-law take pictures of the fiancé with an attractive woman outside a hotel while in Paris, blissfully unaware of the hypocrisy of assigning stereotypes. When they show the sister the pictures, she asks what the hell is wrong with them, that's his ''sister''. They genuinely apologize to him and do what they can to reconcile the families (as the fiancé's father is as opposed to his son marrying a white girl as her father to his daughter marrying a black guy).
* ''Film/SlaughterhouseRulez:'' Clemsie spends a lot of time hanging around Smudgers, touches his arm, and mentions that she loves him. The final act reveals that the two are siblings, not lovers.
* ''[[Film/ReturnOfTheJedi Star Wars VI: Return of the Jedi]]'': Han briefly fears that Leia's avowed love for Luke puts him out of the picture, and promises not to "get in the way." But having discovered Luke is her brother, Leia is able to reassure him. (Of course, considering how vigorously she kissed Luke in the preceding film, Han's doubts weren't exactly unreasonable.)
* ''Film/TangoAndCash'': Cash initially assumes Tango's sister to be his girlfriend. For that matter, so did probably most viewers, since it's never spelled out until Tango accidentally walks in on them. Which, when you think about it, [[UnintentionallyUnsympathetic unwittingly makes Cash far more of an asshole]] when he starts flirting with her behind Tango's back than he would [[MySisterIsOffLimits otherwise be]].
* Used in ''Film/{{The Thomas Crown Affair|1999}}'', where [[spoiler:the young hot girl he's seen dancing with and was in his bedroom is actually his adopted daughter. He could've easily told Catherine this, but he triggered this trope because he wanted to test her]].
* A major plot point in ''Film/ThoroughlyModernMillie''. Millie sees Jimmy sneaking off at night with Miss Dorothy and assumes the worst. The movie ends with her realizing that she loves Jimmy...only to see him going off at night with Miss Dorothy ''and'' Muzzy. When she coolly confronts him and asks if she can join them, Jimmy cheerfully invites her to join him, [[spoiler:his sister, and his stepmother. It turns out the three pretended they were unrelated because Muzzy wanted her stepchildren to find people who loved them for themselves]].
* Early on in ''Film/WithSixYouGetEggroll'', Abby [=McClure=] and Jake Iverson, both widowed with children, make a date for Friday night. Jake calls to cancel, citing his daughter's birthday, so Abby goes to a disco with her sister and brother-in-law, where they see Jake dancing with a pretty young girl. Abby gives Jake the cold shoulder but later learns that the pretty young girl is actually Jake's daughter when she sees her at her son's high school graduation.
* In ''Film/{{Zathura}}'', [[spoiler:when Lisa finds out the astronaut she is attracted to throughout the movie is actually her little brother several years later, she cries, [[BrotherSisterIncest "Oh, my God! And I wanted to--"]] before an explosion cuts her sentence off. Needless to say, she was {{squick}}ed and befuddled by it all]].
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%% This page has been alphabetized. Please add new examples in the correct order. Thanks!
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'''Warning:''' Spoilers Ahead.
[[RelativeError Relatives getting mistaken for]] {{Love Interest}}s in LiveActionFilms.
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* Inverted in ''Film/AfterTheDark'' where it's mentioned that [[StraightGay Jack]] once brought his boyfriend to a party and people thought they were cousins.
* In ''Film/ArchieToRiverdaleAndBackAgain'', Jughead's son gets mistaken for Archie's son by his teachers at their high school reunion.
* In ''Film/{{Bugsy}}'', Bugsy Siegel threatens to beat up a man with his pants off in his girlfriend's house. She's mending a hole in her brother's pants pocket.
* In ''Film/TheDilemma'', Ronny mistakes a man talking to his girlfriend as trying to feel her up. But when he confronts them, Ronny's girlfriend says that the man is actually her cousin -- and he's also gay.
* ''Film/{{Doom}}'': The team of marines has a John Grimm. They meet a HotScientist named Sam Grimm and she and John clearly know each other. John's teammates assume she is his ex-wife until he explains she is his sister.
* In the 2009 film ''Film/DorianGray'', when Dorian introduces himself to Sybil Vane for the first time, he says he saw her previously in a gin tavern but was unable to talk to her because she'd left with another man. He's noticeably uncomfortable, assuming the man was her lover until she says that the man she left with was "Jim... my brother."
* ''Film/GMen'': When Brick, who has become attracted to Kay, sees her kissing Jeff (his boss), he's unhappy at first, but when he learns Kay is Jeff's sister, he smiles.
* The plot catalyst in ''Film/GrayMatters''. [[spoiler:The brother-and-sister team both kiss the same woman, too.]]
* ''Film/KullTheConqueror'': Kull assumes Ascalante to be Zareta's lover since he's so keen on rescuing her. When he asks Zareta directly about their relation to each other, she reveals that Ascalante is her brother. She later becomes Kull's lover, and Ascalante is totally fine with that.
* In ''Film/LettersToJuliet'', this causes Sophie some grief when Charlie introduces her to a woman named Patricia, who Sophie initially assumes is the ex-girlfriend he had mentioned earlier in the film. [[spoiler: It turns out that the Patricia who Charlie was introducing Sophie to was actually his cousin, who just happens to have the same first name as the ex-girlfriend he had previously mentioned.]]
* Inverted in the Creator/WinonaRyder film adaptation of ''Literature/LittleWomen''. A suitor of Jo's calls at the house, where Hannah the housekeeper mistakes him for a European friend of Amy's and informs him that "Miss March and Mr. Laurie are livin' next door". Friedrich takes this to mean that Jo has married her old friend Laurie, but Jo hurries down the road after him to explain that it's her sister who is married.
* ''Film/MabelsBlunder'': Mabel sees her boyfriend embracing a woman and gets the wrong idea. It was his sister, and it was an innocent hug. But slapstick hijinx ensue nonetheless.
* In ''Film/MysticPizza'', Daisy is outside a country club with Kat and Jojo when she sees Charlie, her boyfriend, inside with a beautiful woman. In a rage, Daisy [[ItMakesSenseInContext pours two barrels of fish into his car]]. Then Charlie introduces the woman (named Serena) as his ''sister''.
-->'''Daisy:''' ''[crying]'' I fucked up.\\
'''Charlie:''' Yeah, but you gave it 100% effort.
* In ''Film/{{Parasite|2019}}'', the Parks' daughter Da-hye notices that her English tutor Ki-woo is more familiar with her little brother's art teacher Ki-jeong than he should be. He'd told the Parks that she was a friend of his cousin's. She thinks they're dating but they're actually siblings.
* The French movie ''Qu'est-ce qu'on a fait au Bon Dieu'' uses this early on. An upper-class, white Catholic family has four daughters, three of whom have married an Algerian Muslim, a Sephardic Jew, and a Chinese Taoist. The final daughter is in a relationship with a Catholic... who's black. The three brothers-in-law take pictures of the fiancé with an attractive woman outside a hotel while in Paris, blissfully unaware of the hypocrisy of assigning stereotypes. When they show the sister the pictures, she asks what the hell is wrong with them, that's his ''sister''. They genuinely apologize to him and do what they can to reconcile the families (as the fiancé's father is as opposed to his son marrying a white girl as her father to his daughter marrying a black guy).
* ''Film/SlaughterhouseRulez:'' Clemsie spends a lot of time hanging around Smudgers, touches his arm, and mentions that she loves him. The final act reveals that the two are siblings, not lovers.
* ''[[Film/ReturnOfTheJedi Star Wars VI: Return of the Jedi]]'': Han briefly fears that Leia's avowed love for Luke puts him out of the picture, and promises not to "get in the way." But having discovered Luke is her brother, Leia is able to reassure him. (Of course, considering how vigorously she kissed Luke in the preceding film, Han's doubts weren't exactly unreasonable.)
* ''Film/TangoAndCash'': Cash initially assumes Tango's sister to be his girlfriend. For that matter, so did probably most viewers, since it's never spelled out until Tango accidentally walks in on them. Which, when you think about it, [[UnintentionallyUnsympathetic unwittingly makes Cash far more of an asshole]] when he starts flirting with her behind Tango's back than he would [[MySisterIsOffLimits otherwise be]].
* Used in ''Film/{{The Thomas Crown Affair|1999}}'', where [[spoiler:the young hot girl he's seen dancing with and was in his bedroom is actually his adopted daughter. He could've easily told Catherine this, but he triggered this trope because he wanted to test her]].
* A major plot point in ''Film/ThoroughlyModernMillie''. Millie sees Jimmy sneaking off at night with Miss Dorothy and assumes the worst. The movie ends with her realizing that she loves Jimmy...only to see him going off at night with Miss Dorothy ''and'' Muzzy. When she coolly confronts him and asks if she can join them, Jimmy cheerfully invites her to join him, [[spoiler:his sister, and his stepmother. It turns out the three pretended they were unrelated because Muzzy wanted her stepchildren to find people who loved them for themselves]].
* Early on in ''Film/WithSixYouGetEggroll'', Abby [=McClure=] and Jake Iverson, both widowed with children, make a date for Friday night. Jake calls to cancel, citing his daughter's birthday, so Abby goes to a disco with her sister and brother-in-law, where they see Jake dancing with a pretty young girl. Abby gives Jake the cold shoulder but later learns that the pretty young girl is actually Jake's daughter when she sees her at her son's high school graduation.
* In ''Film/{{Zathura}}'', [[spoiler:when Lisa finds out the astronaut she is attracted to throughout the movie is actually her little brother several years later, she cries, [[BrotherSisterIncest "Oh, my God! And I wanted to--"]] before an explosion cuts her sentence off. Needless to say, she was {{squick}}ed and befuddled by it all]].
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