Season 1 - Episode 04 "A Fish Called Pepper"

Season 1 - Episode 04 "A Fish Called Pepper"
Jeannie moves because her father is given a new job. Afterwords, Louie's grandma comes to visit and, because of her, Louie sends a letter to Jeannie telling her he loves her. Meanwhile, the family gets a pet fish, because they can't afford a dog and cats lick the butter. In the end, Jeannie returns because her father's new job failed.