Michael Francis “Bub” O’Casey, was a feisty old coot of a housekeeper and father-in-law of widower aeronautical engineer Steve Douglas (Fred MacMurray) on the sitcom MY THREE SONS/ABC/CBS/1960-72.
While Steve worked at Universal Research and Development Co. as an aeronautical engineer, Bub stayed home at 837 Mill Street (Phone # Bryant Park 6100) and helped raise Steve’s three sons, Mike, Robbie and Chip. Steve was married to Bub’s daughter and when she died, Bub moved in with Steve and his boys to help him cope.
Bub earned his moniker because the young Douglas kids couldn’t say “Grandpa” hence their attempt in speaking his name turned into “Bub.”
Note: When William Frawley left the series midway through the 1964-65 season for health reasons, he was written out of the script (by traveling to Ireland) and replaced by a similarly crusty old relative named Uncle Charlie O’Casey (William Demarest), a retired sailor.
Shortly after leaving the show, William Frawley died of a sudden heart attack on March 3, 1966. Frawley was famous for his role as the tightwad of a landlord and best friend of the Ricardos on the 1950s sitcom I LOVE LUCY.