Once you find out his father's exact name I can check the census for you again to see if I can find him.
This might be your Regina Cooney: 1930 NY NY Manhattan Cooney John head 30 married at 20 NY IRE IRE dock builder Cooney Caroline wife 37 married at 18 NY NY NY Cooney Regina dau 18 NY NY NY tel operator Cooney Florence dau 17 NY NY NY cashier Cooney John son 15 NY NY NY Cooney Helen dau 13 NY NY NY Cooney James son 8 NY NY NY McCave Mary motherinlaw 74 married NY NY NY
There are 2 John Heslin's in Manhattan in 1930 census John M Heslin b. 1893 John Heslin b. 1908
no John Heslin listed on SS Death index dying in 1948.
I hope this is helpful. This is not my family. Let me know if you have any questions.