[includes sources] The Family Group Sheet gives his birth date as 21 Feb 1735. This is only possible if he was not the illegitimate child referred to in Nov 1732.
According to this tree, Martha Sanford was summoned before Church Wardens of Cople Parish, Westmoreland Co., Virginia in Nov 1732 regarding the birth of her illegitimate child within the past 6 months. She apparently named William Pickett as the father.