I have tried to link Isaac to our family, with no luck (he must be connected, I think).I think I came across Michael's name in my early research, but no other info.I will dig through my old notes and see what I can come up with.I had a theory at one time as to the brothers of William Sr. but wasn't able to get anywhere with it.(That was long before the internet!)I'll try to locate my old notes and let you know.
I've wondered if Sylvester, in Maryland in 1790, might be connected.Also William of Isle of Wight County, Virginia, before 1790.Maybe these were from a German line???