I remember a conversation I had with my brilliant MIT educated brother in 1993, during which he ranted about how evil Bush senior was. I couldn't understand why he would think that, and I argued heatedly with him. We've never been close since then.
Just go with him and use it as an exercise in reticence, an opportunity to observe the liberal wackos, and an excuse to eat popcorn.
No the beauty of it all, is that my brother and I like to argue, him more than me, believe it or not, and don't take any of it personally. I wish that more close relatives had that mind set. At the end of the day, we drink a beer, and talk about sex, or travel, or whatever.
bttt