My respective treat grandfather Duncan was George's brother
A Moseley is correct that MAry married Gen Wade hampton of the Confederate States of Ameerica. I don't understand which you are seeking to link to George or Wade Hampton??
I have much on the McDuffie family I descend thru Duncan's son John B born in Jones Co Ga He fought in Ga 61st and Ga 65th and is buried where he lived in Croset , Asgley Co Ar in the Poley Ridge Cemetery.
Duncan fought in War of 1812 . George did much while in offfice . Please type in a search for him , there is much to read.