The Pennsylvania Archives, www.phmc.state.pa.us/bah/dam/rg/rg47m.htm
has a death register starting in 1810, poor house register 1810-1838, coroner records 1720-1906, deeds 1684-1866, etc.
yOU CAN contact the Bucks County Historical Society, www.mercermuseum.org/collections/research-library/
to see what they have.
Another resource is the Bucks County Genealogical Society, www.bucksgen.org
I'd look for Philip Stever's probate records to see if he had a son Philip. Successful Searching!