I hate you bro!!!

I think you should realize by now that there's no such thing as forever. Yes, he will always be your brother but he will have other loves as well and even love these people more than you. But if you love him, then you would accept and embrace that fact. Sooner or later you would understand that when you yourself would find yourself in love with someone to the point of wanting to spend your life with that person. Then you'll see that it's time that you let loose your love for your family and focus on someone else (this by the way doesn't mean that you no longer love your family).

Remove the evil from inside you. You know what you could do? You should tell his wife what you don't like about her. Don't tell your brother.

It's really not that easy to like a person that you actually hate. Don't force yourself to like your brothers wife because it will actually come in time. Just think of this way, your sister in law loves your brother and that your brother is happy with her.