Mind Games (1989)

Synopsis
Eric (Maxwell Caulfield) is a keen student of psychology, particularly the abnormal kind. When he becomes involved with a family of three who are traveling across the country, the chance to do a little experimenting becomes too tempting to resist. He becomes everyone's confidante, but no one's friend. Gradually, he inflames the pre-existing tensions within the family until it begins to come apart at the seams. ~ Clarke Fountain, All Movie Guide