History BrotherSisterIncest / Films

* ''BladesOfGlory'': villains Stranz and Fairchild Van Waldenberg fairly smolder with sexual tension for one another until they finally fling themselves at each other just as the police are hauling them away. It's OK, though - the actors are married in RealLife.
* ''ElCid'': Prince (later King) Alfonso seems to have a bit of this going on with his sister Princess Urraca. Historians have speculated that the real Alfonso and Urraca may have been incestuously involved with each other.

* ''EuroTrip''. Twins Jenny and Jamie chug down absinthe at a nightclub, become immensely pissed, and start making out with the first person in their reach...realizing far, far too late that they're actually making out with each other. HilarityEnsues.

* In ''JoeDirt'', Joe realizes that a woman who is intensely attracted to him may be his long-lost sister, but because he's normally such a loser romantically, he doesn't tell her until ''after'' they have sex. Fortunately, it turns out her brother wasn't ''long''-lost, they found him again almost immediately, meaning she's not related to Joe. This means they can have sex again, but Joe can't get it up anymore - until they role play being brother and sister. In the present day setting of the movie, Joe then admits he made that last part up to gross out his listeners.

* ''{{The House of Yes}}'': the twins blatantly admit to their incestuous behavior, much to their younger siblings' disgust.
* ''MyChauffeur'': In this otherwise forgettable film, the male and female lead characters hump like bunnies. The next day they find out they might be brother and sister. HilarityEnsues.

* ''TheOtherBoleynGirl'': Anne Boleyn miscarries her second child, then asks her brother George to try to impregnate her, though in the end he's incapable of doing the deed.

* ''[[Film/RepoTheGeneticOpera Repo! The Genetic Opera]]'' has Luigi and Amber Sweet. While all the Largo siblings hate each other, these two have some serious {{UST}} going on. Pavi even comments on it in "Mark It Up".

* ''Say It Isn't So'' Uses this as a joke for almost the whole film. Jo (Heather Graham) and Gilbert (Chris Klein) fall in love. Jo's parents aren't too happy that she isn't dating a rich guy, so they come up with a plan to convince her and Gilbert that they're brother and sister, so that they can become rich. Gilbert realizes they're not related when Jo's REAL brother shows up, then HilarityEnsues when Gilbert repeatedly goes to great lengths to convince Jo that they aren't related.

* FromBeginningToEnd is a Brazilian film about two half brothers who begin an incestuous affair. [[spoiler:The older brother asks the younger to marry him shortly before the younger one leaves for three years to train in Russia for the Olympics.]]
* The plot of ''TheCementGarden''.

* In ''TheCrow'', this is the nature of Top Dollar's relationship with his half-sister Myca.

* Crusty and Maggot of ''AugustUndergroundsMordum'' infamy are introduced having rough sex with each other.

* In ''ThatsMyBoy'', Donny discovers that his son Han's fiancee is having an affair with her brother. He tells Han, who calls off the wedding.

* Intentionally or not, ''HighSchoolMusical'''s Sharpay and Ryan Evans act uncomfortably like a couple.

* In the mini series adaptation of Frank Herbert's ''[[Literature/{{Dune}} Children of Dune]]'' there are strong incestuous overtones with twins Leto II and Ghanima. It's never outright confirmed but they do share many tender moments together, even kissing on the mouth when reunited in the end.

* ''Say It Isn't So'' Uses this as a joke for almost the whole film. Jo(Heather Graham) and Gilbert(Chris Klein) fall in love. Jo's parents aren't too happy that she isn't dating a rich guy, so they come up with a plan to convince her and Gilbert that they're brother and sister, so that they can become rich. Gilbert realizes they're not related when Jo's REAL brother shows up, then HilarityEnsues when Gilbert repeatedly goes to great lengths to convince Jo that they aren't related.

* Backstory for the protagonist's love interest in ''TheWoodsman''.

* ''Franchise/StarWars'': Many a fan has commented that if indeed Leia had "always known" that Luke Skywalker was her brother, that casts the full blown snogging in ''Empire Strikes Back'' in a whole new light.
** The novel ''SplinterOfTheMindsEye'' was the most blatant example. Han Solo didn't even appear in this book (which supposedly took place, chonologically, before ''Empire Strikes Back'' and the two seemed very much a romantic couple. (Of course, the author had no idea at the time that the two characters were siblings; Lucas made that decision later.)
** Also, this ({{NSFW}}) ''SexyLosers'' [[http://www.sexylosers.com/002.html parody strip]]
*** Also, a ''{{Robot Chicken}}'' segment where you see the two lying in bed with one another, before Leia comments "That was so wrong".
** The ''TabletopGame/StarWarsCustomizableCardGame'' referenced this trope with two Dark Side cards depicting Leia kissing Luke, called "[[ThisIsWrongOnSoManyLevels This Is Just Wrong]]" and "This Is Still Wrong". Conversely, three Light Side cards were released depicting [[OfficialCouple her and Han]] kissing, called "This Is More Like It", "This Is Even Better", and finally "This Is Absolutely Right". The last one contains the flavor text, "He's my brother".

* Played with but ultimately averted in ''Film/Scaramouche'': Andre briefly flirts with Aline de Gavrillac but backs off when evidence leads him to believe that she is his sister, and turns his attentions to Lenore. In the end, Lenore gives Andre proof that [[CleaningUpRomanticLooseEnds he and Aline aren't related,]] [[IWantMyBelovedToBeHappy and steps aside so Andre can marry Aline.]]

* In ''Film/{{Godzilla 2014}}'' , the fact that the male Muto's egg and the female Muto's egg were found side-by-side in the same location indicates they're part of the same clutch. Possibly subverted as it's never shown if or how they mate, so the female may have been self-reproducing.

* ''This World, Then the Fireworks'' (1997) a film noir with Billy Zane and GinaGershon as twins.

* The twist in the Australian film ''BeautifulKate'' is that Kate had sex with her twin brother Ned and older brother Cliff. Cliff then killed her in a car crash and committed suicide out of shame.

* There's also nonstop squicky subtext in the creepy-ass 1977 film ''[[RaggedyAnnAndAndyAMusicalAdventure Raggedy Ann & Andy: A Musical Adventure]]''. The Raggedies are explicitly said to be twins, and they get a love song. Yep.

* ''Film/{{Scarface}}'': Tony Montana's violent protectiveness toward his sister Gina has definite elements of this, inspired by the 1932 film it was a remake of, which had its title character carrying on the same kind of relationship with his own sister. This, combined with the effects of his increasing cocaine addiction, culminates in Tony gunning down his best friend Manny after catching him with her (and after she and Manny had gotten ''married'', no less). Gina confronts Tony near the end about it as his mansion is being besieged by Sosa's killers and tries to kill him, but Sosa's men get her before she can reach him. This, among other things, is what finally drives Tony to take up his M-16 and go out with guns blazing.
* ''StarWars'': Many a fan has commented that if indeed Leia had "always known" that Luke Skywalker was her brother, that casts the full blown snogging in ''Empire Strikes Back'' in a whole new light.

* An accidental example in ''Film/Zathura''. Lisa develops a crush on an older version of one of her younger brothers. She doesn't know who he really is until [[spoiler:Walter wishes for his future's self to be reunited with his brother. She's rightfully disgusted by the revelation.]]

* ''[[RepoTheGeneticOpera Repo! The Genetic Opera]]'' has Luigi and Amber Sweet. While all the Largo siblings hate each other, these two have some serious {{UST}} going on. Pavi even comments on it in "Mark It Up".

** Of course, Greg and Marcia aren't blood relations. Theirs is a blended family, formed when Mike, father of three boys, married Carol, mother of three girls.

* In ''[[TheAmityvilleHorror Amityville II: The Possession]]'' Sonny Montelli (based on Ronald Defeo, Jr.) is influenced by the evil in the house to seduce and have sex with his sister.
* In the adaption of ''Film/FlowersInTheAttic'', they removed much of this trope when it came to Christopher and Cathy, but not completely. They are obviously very very close, are awfully comfortable getting naked around each other, and at one point he washes her back for her while she was in the bath.

** At the beginning of the movie, Sammy, one of Juliet's cousins, hits on his sister Georgie and the genetic ramifications of this trope is discussed. [[spoiler: Which, as [[WebVideo/BrowsHeldHigh Oancitizen]] pointed out, foreshadowed the ending.]]

* In Film/EnterTheVoid, incest between Oscar and his sister is heavily implied.
* Richie and Margot's intense desire for one another initiates several important plot elements of {{The Royal Tenenbaums}}. Of course, as Royal would always point out, she's adopted.

* In ''Film/HaroldAndKumarEscapeFromGuantanamoBay'', the titular duo encounter an UglyGuyHotWife couple that are broher and sister in Alabama. Their son has several horrible genetic defects, the most obvious is the fact that he's a cyclops.
* In the 1982 ''Film/CatPeople'', Malcom [=McDowell=] insists that his full sister Natassja Kinski have sex with him as the only way to continue their family. (They will turn into a panther if they mate with a normal human and must kill before they can be restored.) He says that their parents were full siblings as well.

* After all the goat screwing, mass murders, and rapes; it turns out the serial killer couple in ''IslandOfDeath'' are brother and sister.

* A possibly unintentional example, but in Film/{{Transformers}}, according to Sam's [[http://tfwiki.net/w2/images2/c/c7/Witwickytree.jpg family tree]], the Witwicky family tree consists of two generations of inbreeding. This however might just be the fact that Sam did a terrible job researching.

* In ''Film/ThePeopleUnderTheStairs'', "Mommy and Daddy" (the villains) are eventually revealed to be incestuous brother and sister - and that it's a family tradition going back who knows how many generations.

* In ''ThatsMyBoy'', Donny discovers that his son Han's fiancee is having an affair with her brother. He tells Donny who calls off the wedding.

* An accidental example in ''Film/Zathura''. Lisa develops a crush on an older version of one of her younger brothers. She didn't know it until [[spoiler:Walter wishes for his future's self to be reunited with his brother. She's rightfully disgusted by the revelation.]]

* This is brought up, but dismissed, in ''On a Clear Day You Can See Forever''. Todd Pringle points out that, since he is just as much in love with Daisy as Doctor Chabot is, perhaps he (Todd) might make a suitable match for her. When Dr. Chabot points out that Todd is Daisy's brother, Todd responds with, "Only by marriage... she's my step-sister, not my blood-sister."

** The much campier sequel features a pair of real-life [[{{Twincest}} twin sisters sharing a kiss]] in a shower while the [[YuriFanboy male lead watches]].

* In the adaption of ''[[Film/FlowersInTheAttic]]'', they removed much of this trope when it came to Christopher and Cathy, but not completely. They are obviously very very close, are awfully comfortable getting naked around each other, and at one point he washes her back for her while she was in the bath.
* The CliveOwen movie ''CloseMyEyes'' is all about this: he has an incestuous sexual relationship with a sister he's not seen for years. It seems to be some kind of metaphor for the decadence and corruption of Thatcher's England.

* In the adaption of ''{{Flowers in the Attic}}'', they removed much of this trope when it came to Christopher and Cathy, but not completely. They are obviously very very close, are awfully comfortable getting naked around each other, and at one point he washes her back for her while she was in the bath.

* Although whether or not they actually had engaged in incestuous relations in the past is purposefully kept vague (according to the actors and producers), the mutual sexual attraction between criminal siblings played by Eric Bana and Olivia Wilde is most definitely intentional in the movie ''Deadfall'' and in fact drives a lot of the plot.

* There's also nonstop squicky subtext in the [[NightmareFuel creepy-ass]] 1977 film ''[[RaggedyAnnAndAndyAMusicalAdventure Raggedy Ann & Andy: A Musical Adventure]]''. The Raggedies are explicitly said to be twins, and they get a love song. Yep.