Sarah Harbour b. abt 1741 d. after 1779 m. David Witt d. abt 1778, was the son of William Witt, making him a cousin. They lived in what became Patrick County. William received a land grant of 200 acres. Sarah & David had 2 sons, John & William Witt who were deeded the 140 Blackberry Creek tract by their grandfather Thomas Harbour.
https://www.wikitree.com/wiki/Harbour-3