Who is Ernie Thompson in My Three Sons?

Chip's friend who is adopted into the family to maintain the show's central premise of three sons.

Who plays Ernie Thompson in My Three Sons?

Ernie Thompson is played by Barry Livingston.

Ernie Thompson has 6 mapped relationships in My Three Sons. Explore the interactive relationship map for details.

Ernie Thompson — Brother — Chip Douglas (Stanley Livingston)
Younger sibling dynamic marked by shared household experiences and mutual support during family stress.
Ernie Thompson — Grandfather — Steve Douglas (Fred MacMurray)
Grandfather provides childcare and mentorship during school-related challenges.
Ernie Thompson — Brothers — Chip Douglas (Stanley Livingston)
Brothers collaborate on backyard projects and navigate sibling inclusion dynamics.
Ernie Thompson — Aunt — Katie (Tina Cole)
Aunt relies on nephew for childcare while attending personal events.
Ernie Thompson — Uncle — Charley O'Casey (William Demarest)
Nephew expresses concern over uncle's unconventional dating choices.
Ernie Thompson — Uncle — Robbie Douglas (Don Grady)
Uncle manages household chaos caused by nephew's social activities.