I must attend a funeral this weekend. One particular cousin will definitely attend, although nobody really wants them to. No matter the event, this person loudly brings up their beliefs about Flat Earth Science (their term, not mine), the "stupidity of liberals" (again, their words), and other beliefs I won't mention here. A few years ago, they nearly caused a fight at the wake for a gay relative (I won't repeat what he said), so I am one of many trying to think of strategies that would mitigate his disruptive presence.
To be clear, some have tried to dissuade him from coming, but I know that won't work. If anything, it'll give my loud and highly inappropriate cousin even greater reason to say more outrageous things.
How would you deal with such a person so that no friction is created at a time when solemn peace is required?