I have no knowledge of these particular people you mention, but I believe my David Abernathy and his brother Joseph, to have been in the 1820 Giles Co, TN census. If this is so, then they are sons of a Joseph Abernathy, b. 1749, Brunswick Co., VA. This Joseph's father was a David Abernathy, Sr., son of Robert Abernathy III, who moved with family from VA to Lincoln Co., NC, dying, and leaving his will there in 1771. The line goes back to a Robert Abernathy I, b. Scotland, and to VA by 1652.