History BrotherSisterIncest / Films

* ''[[http://www.imdb.com/title/tt1090749/ Consent]]'': A dysfunctional family is plagued with grief after the suicide of the eldest daughter. The parents go about relieving their grief in all the wrong ways. Mostly by disconnecting from their own feelings, and ultimately, their own children. The younger sister Amanda looks for love in all the wrong places. Her emotional handicap creates a particularly awkward situation for her older brother Josh who finds himself on the receiving end of his sister’s misguided search for love. Josh, being the older brother, knows his sister's love for him is misguided and at one point rejects her advance, which upset her.

** The same actors, Richard O'Brian and Patricia Quinn, play different characters (Drs. Cosmo and Nation [=McKinley=]) in the sort-of sequel, ''Film/ShockTreatment'' Cosmo and Nation have a much more explicitly BSI relationship. [[spoiler: Until it's discovered that they're not actually siblings, but character actors with a bad habit of letting their real relationship bleed into their roles.]]

* 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.

* [[http://www.imdb.com/title/tt1090749/ Consent]]: A dysfunctional family is plagued with grief after the suicide of the eldest daughter. The parents go about relieving their grief in all the wrong ways. Mostly by disconnecting from their own feelings, and ultimately, their own children. The younger sister Amanda looks for love in all the wrong places. Her emotional handicap creates a particularly awkward situation for her older brother Josh who finds himself on the receiving end of his sister’s misguided search for love. Josh, being the older brother, knows his sister's love for him is misguided and at one point rejects her advance, which upset her.

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

* In the adaptation 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.

* 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. +

* In ''Film/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.
** Or did he?

* ''Disney/{{Hercules}}'' doesn't mention it, but technically, Hera and Zeus ''are'' siblings as are the rest of the gods.

* ''Film/SayItIsntSo'' 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.
** After they get married, a [[BrickJoke brick falls out of the sky]], in the shape of Susanne Sommers, who turns out is Gilbert's real mother. Gilbert is so happy, until Jo reminds him of what he told her earlier... [[spoiler:using posters of said celebrity as masturbation fodder]] in his teen years.

* ''[[TheBradyBunch A Very Brady Sequel]]'': Averted (barely) when Greg and Marcia bravely fight an attraction inspired by the real-life sexual tension between Maureen [=McCormick=] and Barry Williams in the original show.
** Parodied in ''WesternAnimation/TwoStupidDogs'' in an episode where the dogs go to live with a family much like the Bradys. The teenage brother and sister get into a fight, before the mom tells them to kiss and make up. They proceed to do so ''literally'' by [[GettingCrapPastTheRadar making out]].
** 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. This factors into the situation in the film, since the legality of Mike and Carol's marriage is contested.

* ''Disney/TheLionKing'' may or may not contain a half-sibling example with Simba and Nala. While any shared parentage is never made explicit, the movie never addresses the fact that Mufasa, as king of the pride, would normally be the one to father any cubs, and that Mufasa and Scar (who is stated never to have fathered any cubs) are the only male lions anywhere to be seen.

* In ''Film/TromeoAndJuliet'', the titular lovers find out they're really brother and sister, but decide "Fuck it", and continue their relationship anyway.

* ''Film/CruelIntentions'' (or the very funny parody of that film's semi-incestuous lust in ''Film/NotAnotherTeenMovie'').

* ''Film/{{Oldboy}}'': In this Korean thriller, it turns out that the reason the protagonist is imprisoned for ten years in a hidden private jail is that [[spoiler: while in school, he told people about seeing the antagonist having sex with a girl who (unbeknownst to the protagonist) was the antagonist's sister. In a further twist, it's revealed that the woman that the protagonist falls in love with after getting out of prison is in fact his own daughter, and that the antagonist arranged his captivity specifically to produce this outcome]].

* Film/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 Creator/{{Troma}}[=/=]Astron 6 co-production, ''Film/FathersDay'', has a very explicit example. When the hero, Ahab, finds his sister, Chelsea, for the first time in ten years, he is stunned to see she has become a stripper, and developed into a beautiful, mature woman, and she actually comes onto him. They have sex. [[spoiler: Granted, at the time, Chelsea actually was possessed by a hellish demon that reproduces by possession women and stealing the sperm from men it has sex with - Ahab didn't know.]]

** The same actors, playing different characters in the sequel, ''Shock Treatment'', have a much more explicitly BSI relationship. [[spoiler: Until it's discovered that they're not actually siblings, but character actors with a bad habit of letting their real relationship bleed into their roles.]]

* ''Film/TheRockyHorrorPictureShow'': Riff-Raff and Magenta certainly seem to have a closer relationship than most siblings (just look at a certain phrase above...). The same actors, playing different characters in the sequel, ''Shock Treatment'', have a much more explicitly BSI relationship.

* ''Film/TheRockyHorrorPictureShow'': Riff-Raff and Magenta certainly seem to have a closer relationship than most siblings (just look at a certain phrase above...). The same actors, playing different characters in the execrable sequel, ''Shock Treatment'', have a much more explicitly BSI relationship.

* Used very disturbingly in ''Henry: Portrait of a Serial Killer.'' This trope is something of a BerserkButton for Henry, so when he walks in on his crime partner raping his own sister, he kills them both.

* ''Film/{{Hellboy}} II'': Prince Nuada seems to have a lot of sexual tension going with his sister Princess Nuala. The presence of implied incest was confirmed [[http://www.superherohype.com/news/featuresnews.php?id=6740 by Nuada's actor]].
** And in the commentary by the director.

* ''Film/CruelIntentions'' (or the very funny parody of that film's semi-incestuous lust in ''NotAnotherTeenMovie'').

* 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... who is totally on board with it, to judge by her later remarks.

** Parodied in ''WesternAnimation/TwoStupidDogs'' in an episode where the dogs go to live with a family much like the Bradys. The teenage brother and sister get into a fight, before the dad tells them to kiss and make up. They proceed to do so ''literally'' by [[GettingCrapPastTheRadar making out]].

** The sequel ''GingerSnapsBackTheBeginning'', which places the characters in the eighteenth century... [[RecycledINSPACE somehow]]... makes this even more explicit, [[spoiler: with Bridgette ultimately choosing to be with Ginger over any other considerations. It's also implied in the film that they had killed their parents to be together...]]

* The deformed cannibal siblings in ''Film/WrongTurn 2: Dead End''. The girl gets jealous and violent when she discovers her brother masturbating to the sight of a sunbathing woman.