I would bet good money that this kid is mixed.
He's got that look that you see in some Swedish people who have a black immigrant ancestor. After a couple of generations, the nordic genes mostly reassert themselves, but the negro traits linger. There's a blonde-haired blue-eyed actress (90210) named Annalynne McCord who's part black, but most people never realize it. It's pretty easy to tell, however, that her skin tone and facial geometry are definitely not pure Caucasian.
There's a particularly famous case of an American family who had descended from a single black female slave and her owner. After many generations of only white genes in the line, they still had off-color skin, heavy freckling, and wiry-curly hair. I remember seeing a TV documentary on them (early 90's). It's one of the things that convinced me that miscegenation is genocide for our race, because a single instance can never really be undone in a particular family line.