I'm thinking of falling out with my brother's wife
I am very intrigued, why are you going to have a falling out with your brother's wife?
It's a secret, you see my brother's wife is always against me that's why i want her out of my life.
I am sorry this relationship is difficult but it is not good to fall out with family. Family needs to stick together when times get tough.
I can't help it, she hates me.
I do not think that you would really know that without proper communication with her. Try to ask her nicely and calmly if she has any issues with you and see how you can help her change your mind about you. Family is the most important thing in a relationship, and you should make an effort to have a wonderful relationship with your family members, even your in-laws.