Venting

So i found out today that my brother told my sister he didn't like the fact that her baby is mixed. I mean I'm pissed off about it. My brothers and sister and i dont have the same father hell he is most lilely mixed. My sister is native american and my other brother is mexican and im Irish. He is acting like he is so pure. I really dont want him around my two boys if he is going to be like that. Im not sure what to say to him?