INPAIN66: I'd like to join
Panda 39 and Happy Chappy in Welcoming you to BPD Family.
I became convinced my sister has BPD several years ago. However, she is undiagnosed and doesn't believe she is mentally ill or needs help.
So sorry about the situation with your sister. The uBPD in my life is my sister as well. I found the book "Walking on Egg Shells" very informative. If you haven't read it, It might be something for both you and your husband to read or listen to. I actually listened to the audio book and then got the Kindle version of a workbook that is available.
Things that I've learned from the book and this website, have helped me gain a better understanding of what seemed to be the unexplainable. My sister
SPLIT me, when our parent's health began to fail and they died within 6 months of each other. It happened as soon as we had to start working together to make decisions. My sister wouldn't get any therapy, so I was the one who went into therapy and learned about BPD.
It was very hard to understand how a woman who spends a lot of time at church (and purports to be a Christian), could be such a monster to me. Our current contact is between lawyers, in order to conclude trust/estate matters. Sadly, my sister really needs the money, but she had to go out and get a lawyer. I suspect that it will take going to court to conclude her irrational games. Lawyers will do about anything for money. When all is said and done, a judge won't likely side with her, she already hasn't gotten an early distribution of money, but she will spend thousands of dollars just to fight for her irrational logic on multiple matters.
What I had a hard time making sense of, was how a person with BPD could act fairly normal with certain people, but exhibit behavior of a monster to a chosen few, or a chosen person (usually family members).
You might find this article on lying by Randi Kreger interesting:
Why Do Narcissists and Borderlines Lie So Much? She has been unable (unwilling?) to work for most of her life and has been supported by my 80 year old mother, who is convinced she is to blame for my BPDsis's condition and the fact that her life has not been satisfying.
How is it that your mother feels she it the blame?
We had another big fight last night and I am exhausted and dismayed. I feel powerless and at her mercy.
How are you in contact with your sister, by phone? Is she living with your mother? Are your parents still married?
Depending on where you are, when your sister and you are on a verge of a fight, you can enforce certain
BOUNDARIES. If she calls you late at night, don't take the call. If you take the call and she starts in with her lies, excuse yourself for some reason, and terminate the call. You might want to prepare some responses in advance. If all else fails and you are at a loss for how to get out of further conversation, say "got to go to the bathroom, must have been something I ate"