I probably don't have much to offer, but will share the little that I can anyway.
You said your great-grandfather was from Lebanon and that his surname is listed as Obeid on his immigration papers; that is also my family's last name, though my family emigrated from a small Christian Orthodox village (Mishtai--sp?) in Syria which is currently situated near the Lebanese border.As far as I know, Obeid is a fairly common name in the ME--with variations on it (Abeid, Ebeid, etc.); I have seen it several times in the news from over there.
You said that your family is currently Maronite, but that possibly their origins were Muslim or Druse.As far as I know, there were very few (if any) Muslims or Druse from Lebanon/Syria immigrating to the US around the turn of the century, though possibly I am wrong about the Druse.Most immigrants from Assyria (Syria, Lebanon) were Christians--Eastern Orthodox and probably Maronite as well.My own grandfather came over from Syria around 1917 (as I said, his name was also Obeid (Abraham)and he lived in a small hilly/mountainous village called Mishtai (sp?) which is now about 8 miles or so from the Lebanese border.I was told that originally the town his family came from was across the border in Lebanon but that a war/some kind of dissension broke out between the local Christians and Muslims at the time (back in the early 1800s, I believe) and so the Christians moved into Syria, not far away.
Also, you mentioned that your ancestors immigrated to PA.That is also where the my grandfather settled after coming over on the boat, though not the Pittsburg area but NE PA (Wilkes-Barre).
If you look in AOL's online white pages you will see that there are about 230 Obeids listed in the US alone (hard to believe, I know!).Some are undoubtedly Muslim and some are Christian, but it's possible you have some distant relatives among them.As I said, someone once told me that Obeid is a fairly common name in the ME.
Anyway, someone I met recently on the AOL Syria board (when I was asking about the town my grandfather came from) just IMed me last night and said there was someone with the name Obeid on a geneaology web site.I clicked on it and read your post and thought I would respond.
Good luck in finding out more about your great-grandfather's family.One thing, though.Are you sure about the dates he was born and died on, as that would make him 106 at the time of his death (1890 to 1996)--unless I misread it!