This is the death certificate of my great-great-grandfather, John J. O'Hara. His son, John, who provided the information, was my grandfather's father, aka "Grandpa JJ." John Sr. died 3 December, 1946, at the age of 68 years; his birthdate is given as 1 January 1878. His wife was Mary E. King, and his job was as a realtor. In the 1930 census, Grandpa Molly and Grandpa JJ are seen living in the same apartment building as JJ's parents. But they, like most of the people in the building, rented. John Sr. owned. It's my understanding that he owned the entire building and the rest of the residents were his tenants.
He was born in Ireland, but was a US citizen. His parents names are given as Patrick O'Hara and Bridget Kearney. I would swear to you that I had once seen a document among my grandfather's papers giving John's parents names as Patrick O'Hara and Catherine Walsh, but that was before I got really interested in genealogy, and whatever document that was has been misplaced, and no one I ask has any memory of it ever existing.
John died in Kings County Hospital, where he'd spent all of October and November. The causes of death listed are "Carcinoma of sigmoid" (Colon Cancer) and "Bilateral Pubic Cold Abscesses" (I don't want to know). A contributing cause was the incision and draining of the abscesses, so it seems he may have taken a turn for the worse after they treated him, although the certificate says that the operation was on October 18, and he didn't die until a month and a half later.