I've been looking for Rebecca too, and I think I have a better guess about the answer. (She is my 5th great-grandmother, through Newitt and Sally.)I just got back from a trip to Tazewell Co., among other places, where the library has a neat little genealogy room full of Tazewell & Botetourt & Montgomery & Fincastle Co. history. (The area that is now Tazewell was in each of the four counties at various times.) And in the Court Order Book for Botetourt Co, 1770 to 1772, I find JOHN MAXWELL serving as a Justice of the Peace on the same dates that JAMES CLOYD and ISAIAH VANSANT were on juries or grand juries.(David, Michael and Joseph CLOYD also put in appearances, but James was the one whose name got passed on.)Since John is generally agreed to be the father of THOMAS MAXWELL, and Thomas' brother William married ELIZABETH VANSANT, my guess is that two of John's sons married the daughters of two of his friends.
What is meant by "married" is an interesting question.There is no marriage record for Thomas and Rebecca, and the only reference I've seen is that deed that says that "Rebecca MAY be an heir of Thomas."If they were married, she should have mentioned dower rights. Then again, the MAXWELL family website gives the date of marriage for William and Elizabeth as 1786, while the Taz. Co. marriage records say 1792.Perhaps things were a bit more casual on the frontier.
The famous frontiersman GASPAR MANSKER also turns up in the records, suing URIAH STONE and JACOB HARMAN,"all parties explorers and Hunters in Kentucky, Compeers of Daniel Boone."Stone and the Harman family were both associated with the Maxwell family, and Mansker, his brother George, and George's son George continued to be associated with NEWITT DREW in Tennessee, and with Newitt's son T.S. DREW in Arkansas, for the next 50 years.Some neat stuff there.Check out Gaspar or Casper on google.com.