Thru ancestry.com's Virginia Land, Marriage, and probate Records 1639-1850 I found a William Sr. that died Bef April 4, 1788 per these recordsm married to "Ruth". Four children were indicated in these records, Wm Jr (Abt 1740-Sep 1816), a daughter Sukey, a son Charles (born bef Jun 1789), and a son Robert Beverly. All of this info was determined by several documents in the Virginia Land, Marriage, and probate Records 1639-1850 section. I hope this helps. From info on RootsWeb Wm Jr appears to a daughter Letitia b. abt 1765; a daughter Nancy b. December 20, 1780; a son Thomas b. March 15, 1783 and d. Bef 1840; a son Washington b. December 1, 1783; a daughter Susanna b. Abt 1787; and a daughter Patsey b. 1790.