Liberals were not invited to my home for Thanksgiving or any other day. Perhaps when America is not facing a leftist threat to its existence I can tolerate them again. Perhaps not. But until then, my liberal brother and his parasitic family are not part of my family.
Your brother is still a part of your family. You cannot change a person if you do not communicate with them. Case in point, my son-in-law has listened to me rag on about islam/muslims for years now. He always thought I was being extreme in my views. Well, after many years his light bulb on been turned on and he realizes what islam really is now. Try not to give up all hope on your brother. He really needs your help right now.
Just my two cents.