Re: William Duvall Rev. soldier

The William Duval we are searching for was married to Priscilla Pruett-Prewitt-Pruitt, they had a son named Mareen. I'm not sure if Susanna Duvall was William's sister or daughter. She was married to John Webb in 1775, so I'm guessing sister. I would love to know more about her, I know she moved to Belmont Co. after 1803. John Webb died in Va. in 1803. I'm trying to tie up loose ends and am looking for hard proof that she had a son named Francis Webb. Any help would be greatly appreciated.