I have extended info on Thomas and Andrew as well. I also have a relative that was married to an Elizabeth Neuman, it was to Adam Yerger in 1774, I've often wondered if there was a connection. But the dates to your Elizabeth Neuman and Isaac don't work out. Adam and Elizabeth had one daughter Catherine born in 1775. He remarried again in 1791 to a Margaretha Kurtz and had two sons, Marcus 1792 and John 1794...John is my link....my 5th ggrandfather.