Hi RideauGirl,
Though I'm not glad that they are dealing with what you have dealt with, I'm glad that you don't feel so alone anymore.
Growing up, were you the "fixer" in the family, perhaps an undue burden placed upon you, or The Peacemaker?
While it's good that your brothers finally see what you've seen for so long, it's not your job to fix their relationships with mom. Listen, and offer advice, sure, if you feel comfortable with it, but intervening, especially trying to get mom to change? Sounds like undeserved stress upon you.
The Lessons at the top of the board can help, especially the Drama Triangle:
https://bpdfamily.com/message_board/index.php?topic=108440.0Take a read and tell us what you think.
T