Producer and show owner Jack Wrather realized Rettig couldn't play a boy forever and developed a new storyline with seven-year-old Jon Provost cast as Timmy, a foster child on the Miller farm.
Producer and show owner Jack Wrather was concerned, and realized Rettig couldn't play a boy forever; he decided the series should strike a different course. A new storyline was developed, and Jon Provost was cast as seven-year-old Timmy, a foster child on the Miller farm.