Family Sins 1987

Directed by Jerrold Freedman

Gordon has a loving wife and two sons, Bryan and Keith, but he favors his spoiled younger son Keith over Bryan, who is defiant and not good at sports. As Gordon begins to yell and hit Bryan, Bryan's behavior slips towards the psychotic side and he takes it out on beings who can't defend themselves until he goes way too far one day during a summer camping trip.