Future SIL is marrying my BIL this year and has asked my husband's ex wife to be a bridesmaid along with my stepdaughters. They have been friends ever since their split after siding with her and refusing to hear my husband's side of the story. My husband and his brother have long had a fraught relationship which improves then devolves with regularity. To be clear, she was abusive during their marriage and even afterwards.
Here is where the AIBU is: his brother has asked him to be the best man, but has said he must sit away from me and our son and sit next to his ex wife at the top table. He didn't react well when my husband pointed out the bad blood from the past and that he had no intention of sitting next to his abusive ex wife at the expense of me and our son.
Brother is now accusing my husband of being selfish and making the entire day about himself and that if he truly cared for him he would play "happy families" for him.
AIBU to expect my husband to sit next to me? His brother and future wife haven't been particularly kind nor welcoming to me either so that is colouring my feelings about the situation.