Gadget and Radcliff:
I'll buy the first round in Newcastle upon Tyne.  Just have to find some misplaced ancestors.
To address Radcliff's question, I don't have a good answer.  My guess is that it is not a match.  JPS and his wife Mary had 4 sons that I know of.  Richard (1873), William (1875), Edward (1882) and John (1885).  I am not aware of an earlier son.  I don't have the address from the census form but I would bet they are different.  If you look at the cemetery listed in the death certificate summary on Family Search, it names C.C.  I bet that's Cathedral Cemetery.  For your ease of reference, all of these people lived immediately north of what is now the Philadelphia Museum of Art.  Then, it was a reservoir.  The Cathedral Cemetery serviced this area.  That's also where JPS and Mary are buried.  I'll check and see if any other Stephensons are there.