Deanna-
My research stopped with Samuel L.'s children. I did not pursue the line to more recent times. You are currently in the best position to resolve this problem: you now have a death date and consequently can order a death certificate. You can get a copy of the order form from the web - Google Pennsylvania death certificate. It's possible it will include not just his father's name, but mother's as well. It should also list the funeral home and it may be possible for you to track it or its successor down. Sometimes funeral home records contain other family info. Patience and perseverance. You are doing very well so far.