I located three different Gilbert Andersons on the 1940 census, all living in Jamestown, Chatauqua, New York: one born c 1888, wife Mabel E; one born c 1906, wife Hazel; one born c 1911, wife Jeanne. Is one of these your father?
There also are multiple ones on the 1920 census in Jamestown. So more information would be helpful if you've got any...