In my experience, if a person is part black, the black community accepts that person as a full member. Or maybe it's just marketing again.

Sort of like the Irish, who have regional auditions for the All-Ireland Championships in America (and other places, no doubt.) The idea is that if you're partly in, you're in.

Doesn't anybody want to follow my link (above) and see the adorable twin sisters? I admit it's startling.