Then our president is white; by your standards.
(Did you know the 3 'white' kids were Michael Jackson's children?)
Yes. Though I suggest it is quite debatable whether he is their biological father.
Before he whitened himself, he was pretty dark. While it is not unlikely that a child of a mostly-African and a pure European will look pure European, it is pretty darn unlikely that all three children would show no trace of African features.