Why does a 4 year old make ignorant comments about his mother's race?

Like where would he hear it from? His mother is African and his Father is Irish. He is home schooled and his nanny is African. His parents live apart due to work but he sees them both weekly

He picks up a lot on his mother's dark skin and makes certain comments and also talks like he's not half African. He also asks questions like why is his mother dark etc. There's other offensive things he says which I don't want to repeat.

This is my friend and she is adamant its not the father saying this. Her partners family does not live in the same country as them so it couldn't be them.

What's going on?

Why does a 4 year old make ignorant comments about his mother's race?
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