The parents of William Yopp (married Sibly Litton)is not Samuel Yopp. William Yopp,Jr.died 1853 Poague's Mill Roanoke Co., VA and his brother Charles who relocated from Lancaster County, VA after the Whiskey Rebellion to Botetourt Co., VA abt. 1793 were the sons of William, Sr. and Elizabeth (Clayton)Yopp. Charles Yopp appears to have relocated to Cabell Co, VA now WVA by 1820. John Yopp (m. Winnefred) was a brother of William Yopp.Sr. being the sons of Jeremiah Yopp per Northumberland/Lancaster Apprenticeship recordings.The third identified son of Jeremiah Yopp is Samuel Yopp who no dublt married Mary Simmons.