Juxtapositions, There is a saying that you can choose your friends but not your relatives and neighbors. you have to live with it ; you can not control how other people feel about you but you can control how you want to deal with people. If this is a person that is important in your life, then try to be nice but don't care what he/she feels about you. If it is someone you can avoid, then don't even care about this whole thing. No matter how hard you try it's not gonna work; it's very difficult to change people's minds. And about your cousins, give them time to grow up and one day they will realize their mom was wrong. If they don't then why do you even care? Life is too precious to even care about these things; make good friends as they will be with you no matter what !!!