Pesto,

hello! Thanks for sharing what's going on with your sister.

It sounds like you really want to work through this with your sister. I'm so glad you're taking the time to read up on BPD. She has a unique perspective and learning how she thinks is one of the most loving things you can do for her.

pwBPD often hold an irrational fear of rejection or abandonment, meaning that you may be triggering her without realizing it or meaning to. With most people you can sort through your feelings about an incident, but she sounds highly sensitive so that approach may not work with her.

Setting boundaries is a great idea. There is a time to simply act on the boundary without explaining the reason behind it in full. If you can share a few more details about how she attacks your husband, we can help you think through a way to respond to her to improve your chances of de-escalating.

You're not alone, Pesto.

We get it.

pj