My Fh and I decided he'd ask my brother to be a groomsmen in the wedding and Id ask his girlfriend whom I thought was my really good friend. She is also getting married a few months after me. Now I regret asking her and don't want her in my wedding became she is not supportive. She has nothing to do with any of my wedding planning, she want go shopping with us for bridesmaid dresses, she very mean to my children and worst of all she has been talking bad about my parenting skills to our mutual friends. She has said things like she hates my 4 year old son and She thinks I'm a unfit parent because my 5 month old cries alot due to teething. Ive confronted her about these things but she mostly denies it even though mutual people including my own mother has confirmed it. How do I tell her I dont want her in the wedding without hurting my brother? Help?