pinaction801 on Family Tree Circles

Been working with ancestry.com building my family tree. My father was Peter Paul Einoris from Bridgeport, CT. I would like to know how to find out if he had any other kids. I was born in 1946 and my mother moved us ( my brother and myself ) to California in th 50's and I never had any contact with my father. I recently just found out his birth date & his date of death. Looking for any ideas on how to do this. Thank You