Hi, THe Christ Church parish register has *uel Chowning son of George and Ruth Chowning was born June 15th 1752. And the Daughters of the American Revolution DAR has an application for Samuel b. 1752 Middlesex Co., VA d. 1808 Baldwin Co., wife Mary who died AL. And the DAR has a separate patriot for Samual Chowning who was born 1723 in Middlesex Co., Va and d. 1816 in Caroline Co. VA. You can purchase a copy of the applications but I would be more interested in the documents that were used to prove the people!
The only George I see in my "quick reference chart" is George the son of George b. 1688 and his second wife Martha Tugwell(spelling?). That George was born around 1727 which makes a child Samuel being born in 1752 possible.