All the other Douglases come home early when a baby sitter and Ernie take care of the triplets for the first time.
Little Dodie goes to the hospital for a tonsillectomy and insists that Steve stay the night with her.
Steve's (Fred MacMurray) old girlfriend, now a rich divorcee, comes to town and gives Barbara (Beverly Garland) a few jealous moments.
Steve (Fred MacMurray) gets cast as a tree in Dodie's (Dawn Lyn) school play.
Robbie and Katie (Don Grady, Tina Cole) have an unpleasant personality clash with the couple in the next apartment.