Correction for your message- it was John Vandiver (1774-1846) s/o Edward Vandiver (1774-1846) who married a Margaret. In traditional family (oral) history, her surname was reported as Humbrose, others have reported Hembree. Margaret and John Vandiver chose to name their first son Harbin which introduces another possibility. So far I have not locate a Humbrose family in Pendleton District SC records around this time period, but there was definitly several Hembree and Harbin families in the area. So far I have not seen any real prove as to what her correct surname would have been.