Is it possible to have a white baby green eyes blond straight hair if....

The mother is white blonde straight hair blue eyes

The father is black black curly hair brown eyes?

My nephew was born and my sister says she 100% he's the dad but the baby looks nothing like him and has light hair white skin and green eyes. According to science she has weak genes so the daddys genes would be dominant to hers.

He wont help her and is making her more depressed but I don't see it either so I cant just agree with her and say yea what a piece of shit man he looks just like him when he doesn't... he looks nothing like him..... They are both refusing DNA. She says he's a piece of shit for not taking care of his baby and he says she must have cheated bc thats not his son. So neither of them will agree to do DNA.

I love him regardless he is my blood for sure...

Is it possible or does she likely just not know who daddy is?