My mother's younger sister is her best friend and my godmother. Growing up, our families spent Thanksgiving and Christmas together, as well as going on a joint vacation every summer. A year ago, it would not have occurred to me not to invite her to my wedding.
Towards the end of the spring semester, I was under a great deal of pressure. A fairly tame family story that I had (innocently) shared with my godmother's daughter a year before got back to my godmother. She flew completely off the handle. I went to her home to return some dishes that had been left at my house at Christmas and she cornered me in the car and screamed at me. She called me a liar, accused me of making things up, and did her level best to emotionally break me while I sat there crying. She told me explicitly that she would never bring any of this up ever again, but that our relationship as it had been was over. No one in my family knows about what happened other than my parents, sister, and fiance.
From what my sister and father tell me, my mother and godmother resumed their friendship as if nothing had happened a few days later at a family reunion. (I was unable to attend because I was struggling with final exams.) When I graduated from law school a month later, she and my godfather attended my graduation party as if nothing had happened.
I plan to invite my mother's other siblings, as well as her first cousins (we are very close) to my wedding but I don't want my godmother there. I would also like to invite my godmother's children, one of whom I live with. Is it possible for me to exclude my godmother (and godfather, since he is her husband), even though I know my mother will want them both there and my mother is helping to pay for the wedding?