I'm sorry your feelings are hurt, but I think your making too much of it. You brother told you that his fiancee' was close to her family, so to me it sounds like she is closer to her family then he is to his, He wants her to be happy. I would say just let it go do not say anything or you may cause a problem between yourself and you soon to be sil. And that is only gonna distance you from your brother. Be happy for them enjoy the wedding.