 Eddie Walker (Foy) and Tommy Finch (Victor Maddern) were World War II veterans and old friends who decided to have their teenage daughters live in each other's households for a year because Eddie's daughter Patty (Lynn Loring) wanted to study at the Royal Academy of Dramatic Arts in London.While Patty lived in London with Tommy, his wife Sybil (Diana Chesney) and their son, Neville (Dennis Waterman), their daughter, Heather (Judy Carne) lived with Eddie and Dorothy Walker and their son, also named Tommy (Flip Mark) in New York.The show focuses on the joys and the difficulties that Heather and Patty experience as they live in each other's families.