Hi Barb.I cannot find your Cass ancestors in my database, so we'll have to try to get some names at least one generation further back.
What I would do is this:It's likely that Joseph was in Philadelphia in 1900 when the US Census was taken.I would look him up in the census for Philadelphia in 1900 and see if he's there.If so, you will find his place and approximate date of birth.Then you can start the process of looking backwards through the census and other records, decade by decade, to find Joseph's parents.
Another thing you could look for is Joseph's death certificate, probably in Pennsylvania.This would provide his parents and birthplace as well.If you don't know his death date, you could start by looking into the cemetery records around where he had lived and see if you can find him -- that would give you an approximate date of death, which you could use to find his death certificate.
Another neat piece place to find information is the Social Security applications.If your grandfather John C. Cass Sr. had ever applied for a social security number, that application is still on file and you can get a copy of it.I believe it will contain, in hiw own writing, the names of his parents, his place of birth, and his occupation.
Once you can find his parents, let me know and we'll see if we can graft your branch into the Cass tree!:-)
Would you also like an invitation to the Cass web site?