My Three Sons - Season 6 - Eps 1: The First Marriage
Mike and Sally finally get married and leave for the East where Mike has a job as an assistant college psychology instructor. Robbie happily moves into Mike's old room. When Uncle Charley notes that they may soon be calling Steve 'Grandpa' he becomes somwehat concerned about growing old and calls up his former girlfriends. Robbie, now a college man, offers to help his father make friends with younger women, and while pretending to be disinterested, tries a few of his suggestions. When it is learned that Ernie must return to an orphanage, because he will not be allowed to accompany his foster parents in their move to the orient, Chip invites Ernie to move in permanently, giving Steve three sons once more.
About My Three Sons

Title: My Three Sons
First Air Date: 1960-09-29
Last Air Date: 1972-04-13
Status: Ended
Rating: 6.5/10 (from 33 votes)
Language: EN
Seasons: 12
Total Episodes: 380
Network: CBS
Genres: Comedy, Family
Production Companies: MCA Television, Don Fedderson Productions, Gregg-Don Inc.
Synopsis
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.
Cast

Fred MacMurray
Steve Douglas

Don Grady
Robbie Douglas

Barry Livingston
Ernie Thompson

Stanley Livingston
Chip Douglas

William Demarest
Charley O'Casey

Beverly Garland
Barbara

Tina Cole
Katie

Dawn Lyn
Dodie Harper Douglas