Hi
Bly,

I'm so sorry about the trouble you're having in not being able to speak to your dad. I know that there are other members here who understand exactly what you are going through. I cannot imagine how much grief there is in that, and the anger that comes to the surface because of a pwBPD traits standing in the way.
I was wondering about letter writing, but perhaps that would be intercepted too? Is there anyone close by him that goes to visit him that you could send a message or letter through? If so, maybe they can take their cell phone and call you when they are there? It would be lovely if your sister occasionally needs to leave the house and a friend comes to keep him company during that time...

Wools