Some new clues

Received some documents from my parents last night. One is a letter from James' son George to his mother and father letting them know that he has just become engaged:
















Fortunately, George found "a good Irish Catholic name & girl."

George refers in his letter to an "Aunt Kathie." I believe this is Julia's (James' wife's) sister. It can't be James' sister because he was an only child. In the McMann plot in the cemetery in Greenport, the oldest headstones are for "Mother" and "Father" and "Katherine." The cemetery deed reveals that James purchased the plot in 1921:



I'm guessing he bought this plot when either Julia or Kathie died. That's not directly helpful in figuring out when James died, but it does help to fill in the picture.