STRANGERS ON A TRAIN is a great movie. It isn't quite 5-stars, but it is a wonderfully tense and engaging thriller.
There is no language or sex, though it is stated that Guy's wife is pregnant by another man. There is an onscreen murder (strangling) but it isn't graphic. Several scenes are tense, but not too tense for family movie night.
A great suspense movie for families! It's definitely suspenseful enough for parents and not too scary for older kids (a mature 9+). One of Alfred Hitchcock's best movies I have seen.