I've just started doing some family history. Joseph is my father's biological father. I'm doing some digging on him at the moment, but I would be very interested to see what you have found up to that point.
What I do know is that he was the birth father of all my Aunts and Uncles and my father (10 children), but left for some reason. I'll talk to my father and find out some more.
Feel free to email me back at firstname.lastname@example.org