Hi PP,
Welcome and hello
That's a lot to deal with in one family, I'm so sorry. People here are hard to shock, sadly. How do you feel about the BPD diagnosis? Is your D18 accepting the diagnosis? What are some of the behaviors and traits most challenging for her, and for you and the family? Is she willing to try treatment?
Glad you found the site. It really can help to post, when you are ready to share more details of your story.
LnL