Re: Charles Stein McKeesport, Pennsylvania
If you haven't already I suggest getting his obituary and death certificate. The latter should show his parents' names and the former might as well plus possibly siblings names. Once you have their names you can try to find their death certificates in case Charles' DC doesn't have the info you need.
The Dc you need to get from the PA Div. of Vital Records and I suggest trying the McKeesport Heritage Center for the obit.