Gary, According to the info I have found (not all verified)William Bethany, Sr. was the son of Jacob Bethany, b.ABT 1730 & Hillica Dortch b. ABT 1730(d.o. Nathan Dortch). They were probably married about 1750 in VA. They had at least 3 children, Matthew, William, Sr., and Mary. William Sr. b.ABT 1750-1755, m. Mary UNK. They had at least 5 children: Wm. Jr., Edwin, Mary, Thomas, & Jacob (who married Sarah Higgins).
I have some of the info you gave on Thomas N. and his descendents, but not all of it, and I didn't have the DOD on Jacob. What is your source on this other info so I can check it and document it. I have quite a bit of other info on the Bethany's if you are interested. Jean