Judy, Looking briefly at your Web site, it looks like you have the basics on this line. I am descended from Mary VanZant's son Aaron Biggerstaff through his daughter Lurannah. I apologize that I mainly have information on my direct line, though I can offer quite a bit of interesting material on historical movements of the family and various descendants' historical contexts.
As you may or may not know, Aaron and his siblings were taken from Mary while still very young at the end of the American Revolution. This is because her husband Benjamin Biggerstaff had switched sides. Benjmain's mother's family, the Moores of N.C., included prominent Tories, and Benjamin eventually ended up dying as a Tory, whether that was truly where his "loyalty" if any lay. He previously had been constable for all of Rutherford Co. He died in prison in S.C. during the war.
Anyway, Mary lost the children and had to fight to keep her land after she remarried. She did succeed in keeping the property and the court records show a tenacious woman who knew how to stand up for her family's rights.
Aaron was raised by another family. I don't know whether all the Biggerstaff siblings went to the same or different families.
Aaron married Jane Carter, about whom I have been able to learn nothing. The only child of theirs I know of is Lurannah Biggerstaff, though I'm sure there were others. Lurannah married John Hutchins, the son of Rev. War veteran Thomas Hutchins and Sarah Proctor. Thomas was from a Quaker family in Amherst Co., Va. but he obviously had changed religions by the time he served in the war. He married Sarah in Wake Co., N.C., but I'm not sure where her family was from. There are lots of Proctors in this part of N.C.
Anyway, John married Lurannah and the moved to southeastern Kentucky. I've seen evidence that they were part of a general migration that took place in the early 1800s so other Vanzant descendants probably made the same move.
Their daughter Mary Ann Hutchins married Harrison Taylor (son of Virginian Cornelius Alexander Taylor and N.Carolinian Sally Walker). I believe Harrison and Mary Ann separated after he was unfaithful. But they had several children including my ancestor U.S. Grant Taylor, b. 1866.
USG Taylor in turn married his not-too-distant cousin on the Taylor side, Docia Taylor. They had quite a few children. In 1900, however, he died in a hunting accident. My grandfather, Grant U. Taylor, was born eight months later in 1901. She had several children by a later marriage and at least one out of wedlock. Her children did not always hold her in very high regard. Docia's second husband Jess Brock was implicated in the murder of Harrison Taylor. The two had previously had a dispute over some livestock. Brock died in prison.
Not surprisingly given what must have been a miserably upbringing, Grant Taylor left SE Kentucky at a young age, so young in fact that he lied about his birthday in order to join the army and serve in WWI. After the war, he settled in the coal country of SE W.Virginia, where he married Mary Ellen Wickline. They had 11 children during the first half of the 1900s, including my father. Grant died in 1979.
So Mary Vanzant is my g -- Frank Taylor Jr. W. Melbourne, Fla.