My mom is afraid of a lot of things: his abuse, what will happen to him if she quits letting him abuse her, facing her role in who he has become, etc. My mom is also a really good person and is so healthy in her interactions with the outside world. She is an ACOA though and a huge codie/enabler. It's so hard because I love her so much yet I am so angry with her sometimes about her denial and fear.
I try not to think about my brother because the whole thing makes me so sad, and when I feel sad, I can fall back into enabling. I know with absolute certainty that my brother will never recover while living with my mother.
Andrea, you get to a point where you just have to detach. I'd love to see you do it sooner rather than later. The fact of the matter is, you have a whole beautiful life ahead of you, and being in the middle of your mother and brother is only going to detract from your happiness.