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I cannot think of the name of this movie!! Please help.

A couple goes to like a vacation house in the Hamptons or some place, and while there these 3 Super Preppie kids,(2 Boys and a Girls I think), But they are dressed in like all white, and they terrorize the couple, beat him with a Golf Club, rape his wife and cut her throat while she is tied to a chair, whil they made him watch on the couch. They are super polite kids but psychotic.

Please help me figure this out. It's been killing me.