I can't say I'm surprised. There are towns sprinkled all across the south where there are 2 sets of people with the same last names. A black set of Barkers, and a white set of Barkers. Among the black set, it's widely understood how this came to be, even if it's not mentioned in polite company. This is the case with my own family's surname.
And it almost never fails that the black set claims a biological tie, while the white set distances themselves from claiming kinship with the black Barkers. Wouldn't it be funny if DNA could establish the legal right for thousands of black Barkers to inherit the land and other tangible assets, while the white Barkers are fretting over reparations?