The Sister-in-Law is a 1974 soft core sexploitation drama film written and directed by Joseph Ruben. The plot centers around a hippie who is desired by his sister-in-law and mistaken for his underhanded brother after he returns to middle-class life. The film was his directorial debut starting his thirty year long career. The film was shot in JFK International Airport, Jamaica, Queens, New York City, USA.The film received an R rating from the MPAA for soft nudity, soft sex scenes and some violence.