Season
Episode
- Episode 1: The Great Pregnancy
- Episode 2: Dr. Osborne, M.D.
- Episode 3: Life Begins in Katie
- Episode 4: The Grandfathers
- Episode 5: The Baby Nurse
- Episode 6: Big Ol' Katie
- Episode 7: My Three Grandsons
- Episode 8: Tea for Three
- Episode 9: Back to Earth
- Episode 10: First Night Out
- Episode 11: Cassanova O'Casey
- Episode 12: Expendable Katie
- Episode 13: The New Room
- Episode 14: The Fountain of Youth
- Episode 15: Three's a Crowd
- Episode 16: Chip and Debbie
- Episode 17: What Did You Do Today, Grandpa?
- Episode 18: Chip on Wheels
- Episode 19: Honorable Expectant Grandfather
- Episode 20: The Other Woman
- Episode 21: Goodbye, Forever
- Episode 22: The O'Casey Scandal
- Episode 23: Ernie's Pen Pal
- Episode 24: Ernie, the Transmitter
- Episode 25: The Matchmakers
- Episode 26: Ernie is Smitten
- Episode 27: Two O'Clock Feeding
- Episode 28: Teacher's Pet
My Three Sons Season 9 Ernie's Pen Pal
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.
