Just picked up on this message from long ago. Meredith Vaughan was my 3rd great GF and also 4th great GF (tree becomes sort of a wreath at this point). I have the same info as you about Spotswood Jones. Some other possibilities is that Meredith was a child of an unmarried Vaughan girl. With all the info on the Vaughans of Grayson County, it is a wonder that there is no more info on Meredith that what we have. I am a Vaughan native of Grayson FYI.
Rita V. Harvey
P.O. Box 572