I can't remember what movie, but I remember in 1 movie he did have a black daughter(s).
EDIT:
It might've been "G.I. Joe: Retaliation". He was from a black neighborhood in that movie.
Yes in that movie he plays a black GI Joe Character. Even his wife was black. But the Rock did white wash himself. Anyway Hollywood and white America would rather black actors look ambiguous like the Rock and Vin. They love watered downed knee grows.