Hi Trailrunner,
Welcome to the family!

I really thank you for sharing your story with us. You sound like a very wise and strong woman with a very good handle on what you and your family have been facing in life. I agree - I think depersonalization and not taking responsibility for things that are definitely not ours to take on are extremely important for our own well-being.
There are wonderful communication tools here to the right of the board: see
Basic Tools and
Lessons that you will definitely want to study. And it would be great to discuss the application of these tools as you try them out! We all benefit from sharing our successes and struggles with working with the tools.
Take care!