You can do what some of us in a similar situation do - ignore politics and try to enjoy the family time. My husband, kids, myself, and my brother are the only Democrats and gun control advocates out of a large extended family (4 whole branches of extended family). We just steer away from politics when we're together and try to concentrate on each other and sharing stories and memories. It works for the most part - even with the elitist Republican relatives to the redneck mouth-breathing ones who had their Christmas card picture taken with every single one holding their gun of choice.
Now, that being said, I'm 100% positive that my BILs and SILs have me on "ignore" on FB. But that's OK with me. FB and DU are my online political venting outlets. I do have a FB subset of friends marked as "No politics". I tell people up front that I will move them to that group so they won't see my politicala posts if they would prefer.
Thankfully, my husband and I have a rather large set of friends from church that are of the similar views/opinions as ourselves. That gives us other people to vent to in real life. Our group has participated in the Women's march, March for science, and a few other protests in DC, Dover, and in Newark (Trump impeachment, Immigration, and support of the Mueller investigation). It always been somewhat politically active, but grew out of desperation the night of the 2016 election.
Best of luck to you re: your brother. Try not to let it interfere with your relationship since you have other things in common, shared memories and experiences. I will say that while I have tried to keep interactions and relationships the same, all of this HAS resulted in a change of how I view some of these relatives. Not necessarily loss of respect, but I do view them through different lenses now.
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