I should invite by brothers ex wife and her mom. i speak to both of them on a weekly basis and we are all on good terms. i asked my brother and he said "if you want" my mom and fh say no. there is a small chance him and his ex will do a little arguing back and forth but i doubt it. my entire family is always invited to their family events and usually go. i know it would mean a lot to them to watch her be the flower girl.