I didn't find anything about them in Pennsylvania either.
Do you have their newspaper death notices? They might provide more info about them.
I don't know if Pennsylvania was recording deaths then or not. If they were, find their death records.
Organizations to contact in Virginia:
Virginia Genealogical Society, www.vgs.org
Virginia Newspapers, www.virginiamemory.com/collections/virginia_newspapers
Also do a Google search for German REformed Church and look for records. Successful Searching!