Season 9

Robbie (Don Grady) and Katie (Tina Cole) realize that they will need help with the babies immediately after they are born, and seek out to hire a baby nurse. Uncle Charley (William Demarest) wants the job, and is disappointed by not being asked, so he sets out on a series of baby sitting jobs to gain experience. He panics in his first experience with an actual baby and needs to call in Katie for advice, but he quickly becomes the favorite baby sitter in the neighborhood. While Rob and Katie realize he could do the job, they feel it is too much to ask now that Charley has a successful baby sitting career, but Charley overhears the discussion and realizes that he needs to volunteer for the job.