I am hoping that you are still monitoring this site.
I was taken by your mentioning Nicholas and Martin in regards to the George family.
In my research, I have a Nicholas Lawson George who had a brother, Martin.Both were sons of Benjamin George, Jr. and Catherine Lawson. Nicholas Lawson George married his cousin, Susannah, "Sukey" Tapscott 1783 in Lancaster County, VA.
If this seems to relate to your needs, please let me know.