Season
Episode
- Episode 1: The Advent of Fergus
- Episode 2: Fergus for Sale
- Episode 3: Lady Douglas
- Episode 4: Goodbye, Fergus
- Episode 5: Four for the Road
- Episode 6: Polly the Pigeon
- Episode 7: Happy Birthday, Anyway
- Episode 8: Proxy Parents
- Episode 9: The Enthusiast
- Episode 10: Katie's Career
- Episode 11: Polly's Secret Life
- Episode 12: The Sound of Music
- Episode 13: TV Triplets
- Episode 14: Three for School
- Episode 15: Alfred
- Episode 16: Buttons and Beaux
- Episode 17: Peanuts
- Episode 18: Bad Day for Steve
- Episode 19: Second Banana
- Episode 20: Bad Day for Barbara
- Episode 21: The Birth of Arfie
- Episode 22: Lonesome Katie
- Episode 23: Barbara Lost
- Episode 24: Whatever Happened to Ernie?
My Three Sons Season 12 The Enthusiast
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.
