My mom just told me that she wants to invite one of my uncles (I have 3 total and they are all her brothers). The other 2 I absolutely love and are amazing, while this other uncle is a raging alcoholic, had a nasty divorce with my aunt, the last time I saw him was 12-13 years ago, and the time before that he started a fight with my dad and punched him in the face. Family ties are pretty much cut with him for my aunt, his children, me, and other family members. My mom though, wants to invite him as not inviting him would mean completely cutting him out of our lives. I am okay with this as he also punched her when I was a child too, and I saw it. My family is very loving and wonderful, the only problem person is him. She even is anticipating him starting something at my and my FH wedding, and said she would never forgive him if he ruined it. If she is already thinking he will ruin it..but still doesn't know whether or not to invite him - How do I convince her not to?