Who is Charley O'Casey in My Three Sons?

Bub's brother who replaces him as the live-in family member starting in 1965 due to Frawley's health.

Who plays Charley O'Casey in My Three Sons?

Charley O'Casey is played by William Demarest.

Charley O'Casey has 9 mapped relationships in My Three Sons. Explore the interactive relationship map for details.

Charley O'Casey — Nephew/Dependent — Steve Douglas (Fred MacMurray)
Dependent family member navigating shifting roles and seeking belonging within the household.
Charley O'Casey — Supporter — Robbie Douglas (Don Grady)
Grandfather who actively supports Robbie's social life and confidence building through hands-on guidance.
Charley O'Casey — Uncle — Steve Douglas (Fred MacMurray)
Uncle offers practical advice on civic engagement and personal conduct.
Charley O'Casey — Seasonal Figure — Barbara (Beverly Garland)
They anchor the social calendar and community events throughout the season.
Charley O'Casey — Aunt — Katie (Tina Cole)
Aunt provides emotional support and discreetly coordinates family assistance.
Charley O'Casey — Uncle — Ernie Thompson (Barry Livingston)
Nephew expresses concern over uncle's unconventional dating choices.
Charley O'Casey — Uncle — Chip Douglas (Stanley Livingston)
Uncle and uncle jointly monitor and discuss nephew's rapid romantic development.
Charley O'Casey — Uncle — Robbie Douglas (Don Grady)
Uncle seeks guidance from nephew and aunt on infant care responsibilities.
Charley O'Casey — Cultural Contrast — Barbara (Beverly Garland)
A subtle cultural divide exists between Charley's past and Barbara's present-focused duties.