His dad, my uncle-by-blood, passed away years ago. His mom has remarried and causes arguements with the family whenever we do see eachother. I don't want to invite her (and I know she would show up uninvited if she knew the wedding details). We are having a small wedding (65 people), inviting the rest of our cousins, but I'm afraid of evil-ex-aunt finding out and showing up and ruining (she would!) everyone's mood. Cousin and I used to be close, but have grown apart since his father died. What would you do?