Capt. George Whitefield

According to records I have found, I believe I am descended from Capt George Whitefield, who surrendered Ft. Charlotte, South Carolina, to the American cause during the Revolutionary War.Also according to records, he was a nephew of the Rev. George Whitefield.I have a list of the Rev. George's ancestors back to a Whitefield (different spelling) who was rector of St. Dunstan Church at Mayfield, England during the 1600s. However, I can not find which of Rev. George's brothers was the father of Capt. George. Would appreciate any information that might help.