Thanks. She has a therapist, and some family members have interacted with the therapist, but the therapist seems (almost bewilderingly) oblivious to how serious and abusive and concerning her behavior has been. She seems to approach her like a "regular" client.  It is incredibly frustrating.

This makes sense. It may also be that she struggled with a manageable level of the typical symptoms before, but the trauma around this family tragedy was too much for her. Her hostility to my mom and her spouse prior to this was outside the realm of "normal" but still much less pervasive and extreme, and it would pass. This feels like a constant cycle that never lets up and only gets worse.  I didn't mention in the original post, but this is ALL of our interaction with her for 18 months. There have been no family gatherings, visits, regular conversations, or even attempts at these because all she seems to be able to do is attack and threaten, and there are children and older people that don't need to be exposed to that.

Hello and welcome to the family.  I'm so sorry you're going through this but I'm very glad that you found us.

There's some major clues if what you shared; starting with the hostility towards mom and her spouse in the past.  BPDs have a tendency to see things in black or white, good or bad.  If you're viewed as good, then you don't see the hostile side of them and you might describe them as kind, loving people.  But if you're seen as bad, then you might say that same person who used to be so nice is mean, spiteful, and full of hate.

Yet it's the same person.  The difference is how they view you and their tendency to think in absolutes.

For example, if we met and talked real for an hour or so, you'd learn some great things about me and some not great things.  You'd keep all that in perspective though and then form an overall opinion of me...not taking any one thing I said as what defines me.  As people, we're complicated, so it takes some processing to see the full picture.

The BPD in your life doesn't do that though.  To them, everyone is a fantastic, loving person until one thing happens that changes their mind.  Then, they are terrible, completely evil people who deserve the absolute worst in life.  There's no middle ground, no shades of grey....only the whitest white or the blackest black.  It's the foundation of the mental illness and the havoc that follows.

I said all of that to say your sister has not changed.  You're simply seeing the mental illnes for the first time because you're on the other side of the coin.  I hope that helps.

As you wrote, there was a major trauma about the time of her sudden rise of negative behaviors and push/pull incidents.  Triggers too can raise the level of discord suddenly higher.

In my case, I had been married for over a decade with only slowly increasing "episodes" or ragefests.  I thought having a child would make her happier. I was so clueless, having a baby changes a twosome relationship forever.  I already knew she had a horrible stepfather but it took me years to conclude that she no longer saw me as a husband but a father - you can guess to whom she compared me.  By that time our marriage was toasted and the divorce was even more complicated by the custody and parenting issues.

A typical suggestion here is that therapy is highly recommended, since her emotions with the family are so elevated.  A trusted therapist can potentially work wonders if only she would listen and apply the counsel in her perceptions and life.  That is an immense task for a person with BPD traits (pwBPD) since the unstable emotions, intense blaming and blame shifting are difficult to overcome.

Hello. I'm so sorry to hear what you're going through.  I have not had the experience of this coming on suddenly.  Wishing you lots of support and grace in navigating this.

Hi everyone. I have so much to work through concerning my sister with UBPD, but one big question sticks out for me. has anyone else had someone begin displaying serious BOD traits somewhat suddenly?  My sibling had some mood and anger issues, which she mostly directed only to our mother and her spouse, and she could crack under pressure/stress a bit, but we all had decent relationships with her. I would never have described her as someone with a personality disorder.

Around a major trauma that occurred in my family about 18 months ago, she began behaving in an extreme way that meets the criteria - spasms of attacking, hateful, hostile messages and calls; blame; rejecting or twisting all efforts to reconcile; spiraling and escalating, even when no one responds. She will send a message saying "I hate you. My life is so much better without you. Do not ever contact me again," and then a day or two later, she will start calling, and when the calls are not answered, more messages:  "What kind of family abandons a loved one like this? All I want is to be part of a loving family. Instead I have nothing. My life is worthless."  Lashing out indiscriminately, including at "innocent" family members who simply decline to take sides or _____-talk other family members. Absolute refusal or inability to acknowledge the impact of her words and actions or how they lead to consequences - and certainly no recognition of how she is hurting others.  Threats to expose private personal information to "destroy" family members' reputations, careers, and relationships, which she recently acted on by contacting total strangers and young family members with this information. Meanwhile, in other areas of her life, socially and work, she appears totally normal and even thriving.

It is horrifying. And it fits the criteria.  But where did it come from?  Could this have been hiding in her all this time?  Or it is something new that was triggered by the trauma, like a narcissistic collapse?  Has anyone else's BPD family member gone from being "normal" to this level of disorder?

Again, have another "me-party". 

"I am so sorry if that's how it came across because I'd never want to do anything to hurt anyone.  I was so overwhelmed and I was doing the best I could.  Please forgive me if that upset you."

After your "me-party", what left for the BPD to argue about?  You validated their feelings.  You apologized for hurting their feelings.  You've given them absolutely everything they wanted and you didn't say a single word about what actually happened.

Sometimes, when my BPD ex wife or BPD daughter want to argue, I'll just say, "You're absolutely right.  I should have done better back then."  And they're shocked into silence.  How can they argue?  I just agreed with everything. 

The thing I should have "done better" with was avoiding topics with mentally ill people, but there's no reason to say that.  They get what they want (validation), while I get what I want (no arguments, flaring emotions).  It's an absolute win-win.

Thank you, all, for the support and the great advice.  It's all a little complicated because before the NC there was LC based on her refusal to respect my boundaries.  BUT what you have given me here, I believe, is a set of principles that I can apply to the specific situation. 

I think the key one is the "me-party" . 
      The break was because I needed it. 
       I can listen to and validate her feelings unless she's crossing my boundaries. 
       In that case, it's "I can't do this. I'm going to get off the phone. Let's talk another time."

Also, keep it light to the extent possible.

I think one of the things that's really hard is being pretty sure that she's going to start telling me a version of what happened that didn't happen.  (I know that because she's been doing it in texts.)  I can't validate untruths, but I thought I could say something like, "I know that's how you remember it.  I remember it differently but I understand why you feel the way you do since that's how you remember it."   Yes?

I think it's okay to go there, but you have to throw a "me-party" with your answer.

"I was in such a tough place in my life, I was struggling and stressed out and I just needed to take a step back from everything for a little while."

In other words, every word is about me and my mental health.  Nothing is about the other person.  BPD's understand mental health struggles and most of the time, they want to fix it in others because they can't fix their own stuff.  So a statement like this builds empathy and respect because it's admitting what a BPD never can say out loud.

Don't even think about mentioning the BPD in that statement though, then it brings pure wrath from all the emotions involved.  It's much better to leave that part unsaid.

That makes sense and it will probably be the play.

In an interesting turn of events, I'll be moving back to that area in maybe a month and I'll actually need the truck to get my stuff out of storage to a new house.  I've already decided though that I'm just going to rent a U-Haul for the day or maybe even a local moving company- it's stress free that way and I won't get upset over the current state of the truck.

Thanks for the advice though, to you and everyone who chimed in for my little rant here!