I'm pretty sure his first wife was Sarah Bryan.His brother Thomas married Margere Bryan, daughter of John Bryan b. 09 Apr 1730 and wife Sarah ???.John's will lists a daughter, Sarah Allen, indicating he had two daughters who married Allen men.I suspect we have the common case of brothers marrying sisters.
John Bryan is a son of Morgan Bryan.I don't know the relationship between Morgan and Squire Boone, but they must be related as they lived near each other.
I have only seven children by Sarah. I have twelve children by Elizabeth. If you have documentation for more, I'd love to have a copy.
I don't know the parents of Zachariah and Thomas, but the brothers grew up in Rowan County, NC, moved to Davidson County, TN and finally to Greene County, IL.
I know that Zachariah Allen whose will is in Orange County, NC in 1790 is NOT their father.His son, Zachariah, was born about 1774.I don't know much about that son Zachariah, but many of his siblings moved to Lawrence County, IL.
Sarah "Sally" Cassandra Boone, daughter of Squire Boone and Sarah Morgan did indeed marry John Wilkcockson, Abt. 29 May 1742 in Exeter Twp., Lancaster County, PA
Zachariah's son, James Martin Allen, was born 30 May 1794.