Mathmom, welcome. I want you to know you're safe and in good company. Many here are dealing with very similar dynamics with aging BPD parents. Check out Methuen and NotWendy's posts.
The hardest part for me, no matter who is displaying the hurtful behavior, is releasing. Releasing some of the time I spend thinking about it, releasing others to choose what they want, releasing the urge to step in or fix when others have been irresponsible, releasing myself to have peace and enjoy life, and perhaps most difficult of all, releasing the guilt I've been trained to feel. Is the releasing hard for you, too?
I can imagine that you and your sister feel all of the burden now that your brother has stepped away from it all. None of this is easy, is it? It won't get better overnight but there is hope. This can improve.
