1930 census has (brother in laws) Henry P. Mahaney and Francis E. Mahaney, with sister Elizabeth, her husband James P. Donahue, and a daughter (Bernadette Mahaney, age 7mos) at 165 Franklin Ave., Queens, NY. Ages/relationships match those in 1920 census in Oswego. See the census image to see if it is really Donahue or Donaher.
A Henry P. Mahaney (born 24 Jul 1908, died 3 Apr 1968) and wife Kathryn Mahaney (born 26 Jun 1909, died 6 Apr 1955) are buried in Long Island Nat'l Cemetary Section 2A site 3920 (WW2 Navy Vet)
Do you know anything about William J. Mahaney and wife Elizabeth (Rowan) with son Joseph W. Mahaney ages 47, 46 and 13 respectively at 262and a half Fifth St., Oswego in 1920 census. Elizabeth's sister, Sarah Rowan and husband Patrick Drumm at 262 5th. William Mahaney age 8 is listed at 208? 6th St., Oswego in the 1880 census. William Mahaney age 28 is listed at 267 W. 7th St. in the 1900 census. If you are in the Oswego area, I am researching the Rowan family (Oswego 1850s and later)and descendants of Patrick Drumm (born about 1887) of Oswego.