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You distance yourself. It's not your job to be their go between or the peace maker. If they want to say something to him, they can say it to him.
At this point, you need to think about which relationships you want to cultivate and which ones you are happy to step back from.
You don't even need to part from them dramatically. Just a simple "right well I'm going to be over doing life with George, you know where to find me if you need me".
You also need to remember that it doesn't have to be that way forever. Maybe a little break from being so close to your family will be the best thing for you all.
Maybe a simple apology is needed (perhaps from both sides, but someone has to go first). A simple ‘ I’m sorry if you were offended by what I said, that wasn’t my intention. Can we agree to disagree and move forward?’
I assume you have kids, and it would be a shame for them to miss out on having a relationship with their grandparents and even aunts and uncles because someone said something stupid or something was taken the wrong way.
If that doesn’t smooth things over enough to ease the awkwardness at family gatherings, maybe you do need to stay away for awhile. but it doesn’t have to be forever.
Was this the argument about the sister?!
Does your husband hit you?
My parents have done th same thing, and my mother is very two faced. At this point we just ignore her and distance ourselves. We are polite but no longer get upset by their bullshit.