Wouldn't Michael Jackson's kids be half black?

I do not want this sound at all offensive, but wouldn't Michael Jackson's kids be black? I mean he was originally at first black, so he's still the same black person as he was before because of his DNA right? Then he had 3 kids with a white woman, but none of his kids look at all black or even half black. So like if you look white, you're not black? Or what? Someone please tell me.