A widower and aeronautical engineer named Steven Douglas raises three sons with the help of his father-in-law, and later the boys' great-uncle. An adopted son, a stepdaughter, wives, and another generation of sons join the loving family in later seasons. Fred MacMurray, Don Grady, Stanley Livingston, William Demarest, William Frawley, Barry Livingston, Tim Considine Added on Amazon Prime 2024-02-24.