Maid for Each Other/Lost and Found/Then There Were Two
S4:E27
1981
IMDb
Gopher's (Fred Grandy) aunt (Jane Powell), who Gopher doesn't know is a maid, comes aboard with her employer (Mary Wickes) and falls in love with a fellow passenger (Howard Keel); a playboy (Joe Namath) uses an old girlfriend (Karen Grassle) in a scheme on his best friend (Fred Willard); a baby boy is reluctantly abandoned by his father (Gary Burghoff), who is a ship's mechanic, and finds a sympathetic listener in a passenger (Belinda Montgomery), who is an old high school friend.