Seating request to avoid a bigot?

I'll be a guest at a cousin 's wedding. We have a family member who is constantly making ignorant racist comments, and spreading conspiracy theories, and generally sounds hateful and unhinged. I feel sorry for him and do have some affection for him, but I can't stand to listen to this garbage and I don't want to expose my family to it. Can I ask to not be seated with him? Thanks.