Anonymous wrote:OP here. thanks for all the ideas and support. I WISH they would do therapy but they have never been open to it and don't perceive that there's a problem here. I will try and rope my brother in a bit more. He is across the country and less flexible than me for travel, but he could take on my mom's venting at least. Sigh.
Do that. And don't feel the need to jump in when he drops the ball. You need to reframe your entire role here. There will be plenty of actual physical injuries or illnesses you'll have to deal with - the venting can fall through the cracks.