My brother's fiance asked me at dinner the other night if I was inviting her Mother (whom I barely know) to my wedding. I said no, it was just her and her two sisters and their husbands. Tonight my brother called and informed me I was rude not to invite her mother! His reasoning is that because I accepted an invitation to her Mother's birthday party last year (that the three girls gave her) I should invite her mother to my wedding. I told him I only accepted going to her birthday because I was invited and I went because he was my brother and her future mother in law. He said if I don't invite her none of them would go to my wedding. I told him I was still inviting them (not Mom) and it was up to them if they attended my wedding or not. Am I wrong?