Quote Originally Posted by Crankin View Post
Your sister will never change.
Hold your boundaries and care for yourself.
Sadly, although you cannot diagnose a personality disorder until someone is 18, I am treating a 13 year old who is exactly like your sister.
My sister never behaved normally. She was abused by my mother for one thing and the mental health genes in my family did not help matters. Of course, my parents never did anything constructive to help her. Rather, they simply reinforced her attention seeking behaviors. Meanwhile, I did everything in my power to be her exact opposite and, as a result, I got/get no attention from my parents. They don't respond to healthy behaviors.

I hope you're able to help your client. My understanding is that BPDs are very difficult to treat. My own therapist avoids them.