All Night Long (1981)

Executive George Dupler loses his temper and is demoted to the night manager at a 24 hour drugstore After he suggests to his teenage son Freddie that he stop having an affair with suburban housewife Cheryl Gibbons who is a distant cousin Cheryl tries to seduce George At home in front of his mother Freddie accuses his dad of stealing his girl because he found Cheryl serving George a meal in the middle of the night while her husband Bobby was on duty at the fire station George then separates from his wife Helen quits his job moves into a warehouse and asks Cheryl to move in with him