odd reactions to pregnancy from family

Crickett★★★
I'm pregnant with my second child. I was speaking to my boyfriend's uncle and didn't realize he didn't know because his wife knows. When I said that I was pregnant, he started saying that we fucked up. I asked him why. He goes on about how expensive kids are, and how hard it is. I had to remind him that I already had a child. My son is four for crying out loud. Then he says, "Yeah but you've never had a biracial kid!" I don't even know what he means honestly by that. Any idea's?