I am wondering what the etiquette on this is. My mothers eldest brother has two sons both married and have children of there own. This is an especially dramatic family as a whole ALWAYS causing some problem within the family. I plan on inviting my uncle his wife and eldest son, but the younger son has been more than inappropriate with me (I'd rather not describe how) and at other family events. At his brother's sons birthday, one of my other uncles bumped into him while dancing and cousin ended up spilling his drink on his wife. Cousin is clearly pissed, but we didn't think he'd do anything. Ten minutes later, he goes and hugs the uncle who bumped into him and then pours a glass of wine down his back. That is just one example of the shitty things he's done. I really don't want to invite him. In fact, I've stated this to my mom several times (she doesn't know about his inappropriate actions) but I'm pretty sure she thinks I will change my mind. I don't talk to this cousin and haven't in years but I do see him at family events.
Questions are: How do I explain to her that he's not invited? How do I make it clear that he's not invited (he lives with his mother and father)? As a note, in our culture people tend to just show up to weddings/parties with or without explicit invitations.