I believe you can find some information about John and Elizabeth Thurmond if you look up "Ancestors of Judith Alma Porter of Amherst County, VA" at http.//www.geocities.com/Heartland/Lake/14//jporter.html
John Thurmond was the son of Philip Thurmond of Albemarle County, VA.He originally married Molly Dickerson and later married Elizabeth Goode.He then left VA.We think he went to Edgefield, SC and started the line that included Strom Thurmond.There are some who say he is the forebear of a Georgia line.
He had a daughter named Frances Caroline.
I know for a fact John was married to Elizabeth because both of them are mentioned in Philip Thurmond's Will dated 1774.
Hope this gives you something to work on.My forebears came from the Philip Thurmond family, through his son, Philip Jr and Phillip's son, James Thurmond who moved to GA in the late 1700s.
Barbara Thurmond Van Horn Marietta, GA E-Mail: firstname.lastname@example.org