what should I do?!?!

So I've been in a very good relationship for some years now. We have an 8 month old baby together and amongst the 3 of us we're very happy, but whenever we're around my SO's family it's nothing but drama. We're an interracial couple and they seem to always find a way to make me feel like an outsider. It's gotten so bad that I'm to the point of wanting to pack up my family and never see them again but that's his parents and sisters, what do I do?