Wish I had more for you.Have you tried the 1880 census for Bangor, Maine?There might be something there.A long shot could be the 1900 census for Brooklyn, 12th ward. Also, I've found pension records give a lot of information.I have some from my gggrandfather Sullivan from the Civil War, and the names of his wife and all his children, along with their birthdates, are included.I would think since Jack's father served in the army there may be something there.Unfortunately, the price of obtaining pension records seems to have skyrocketed since I last sent for mine. It's occurred to me that Jack's brother Con may have been named Cornelius? Good luck. -Pat.