I don't know where to start. My DM lives with us. My parents are divorced and she has no-one else. She is quite a difficult person who takes offense at everything and then causes a fight. She doesn't apologise ever or if she does she becomes a victim and makes everyone else the bad guy.
Our DD is at uni but comes home for Christmas and they butt heads constantly, causing fights. My DM then usually uses the silent treatment. If I try to intervene, I am accused of always taking DD's side. Honestly, it's usually because DM loves to criticise or say passive aggressive things and then when someone responds, she takes offense. She doesn't see that she provokes people.
It's gotten to the point where I am constantly anxious, trying to avoid leaving them on their own, and trying to distract my mother from any offense. It makes me uncomfortable in my own home.
I don't know what to do to make things easier.