My cousin married an abuser, who talks a lot of shit about our family, called another female cousin a cunt to her face at my grandfather's bday, all and all real peace of shit. However said cousin is still with him and still in love with him and defends this cockface with violent (literal) devotion whenever anyone says something about him. I don't talk to him or have anything to do with him. I refuse to shake his hand or anything like that. We have another wedding in our family in a few days and cockface will be there and be taking over the open bar, talking shit about again, etc. How do I treat this sort of scum if he starts shit again? How do I deal with his fucking moronic wife who's just shaming us on a daily basis by defending him to the nth degree?