Another edit: the trick to shooting dark-skinned black people is to blast their faces out with full frontal lighting. The work turns out perfect.
When I photograph black families in my studio I always use an Octalight or a medium soft box in the butterfly lighting setup, plus a couple of gentle edge lights. You really do need to get light coming from right above the lens axis. Then again, I light a lot of white people this way, cause it just looks terrific!