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1h 35mRDirected by J.B. Rogers
They share a love. They share a passion. And they might share DNA.
Boy meets girl; boy falls in love (and had wild, non-stop sex) with girl; boy loses girl... when they discover they are brother and sister! But when he learns that he's the victim of the ultimate case of mistaken identity, the lovesick young man -- whom everyone still thinks is after some taboo thrills -- must race across the country to stop her from marrying another man.
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Chris KleinGilbert Noble
Heather GrahamJosephine Wingfield
Orlando JonesDig McCaffrey
Sally FieldValdine Wingfield
Richard JenkinsWalter Wingfield
John RothmanLarry Falwell
Jack PlotnickLeon Pitofsky
Eddie CibrianJack Mitchelson
Mark PellegrinoJimmy Mitchelson
Brent HinkleyStreak
Henry ChoFreddy
Richard RiehleSheriff Merle HobbsAvailability for Say It Isn't So by JustWatch, via TMDB. All options