The Love Boat (1977) : 3x18

A singer worries that his hillbilly relatives will embarrass him and ruin his chance of catching a record producer's eye. The producer becomes attracted to the singer's sister, who begins to doubt her commitment to her fiancé from back home. An author pictures the family as potential characters for her next book. She poses as a mountain woman to get the grandfather to open up to her. Doc, Isaac and Gopher room with Capt. Stubing after their cabins are flooded. They proceed to drive him crazy, and won't let him get any sleep. Two couples take the cruise together. One of the women tries to convince her friend that their spouses are having an affair.