Yes I think one grandmother was white — he looks half white, though.
And yes he did marry a white woman recently. A blond. I would have loved to be a fly-on-the-wall when he told dear old dad he was about to marry one of those white devils (though at least not from east Memphis).
No! I know for a fact that neither of his grandmothers were white. And, yes Jr. does look white, but his uncles are light as well. There was a white in the woodpile somewhere, but not the grandmothers.