The information you have given indicates that your grandmother Bettie’s maiden name was Vincell and you believe her parents were William and Rachel Vincell. She apparently got married and had a son Charles. She and her husband died when Charles was young and Charles was raised by his Vincell grandparents.
Another source leads you to believe that a William James Vincell, son of Lewis Vincell, was your GGGrandfather. Did that source give any information as to where these people lived and what time period?
You still need to supply more information which I think you already know. What was your grandmother Bettie’s married name? Do you know the name of the man (Charles’ father) she married? About when was Charles born? Did the marriage of Bettie and her husband, the birth of their son Charles, and the death of Bettie and her husband all occur in Loudoun County, Virginia?
Please verify that these events occurred in Loudoun County, Virginia (as this is the Loudoun County message board) and give some know dates for the events you have stated, or at least a general time period.