
Hi enough abuse,
I'm so sorry about your sister's behavior toward you and your mom. That is hurtful and I understand your desire to just be done with it once and for all. You have come to the right place for support. There are many people here who can empathize and who have experienced similar situations. There are lots of tools here, too, which can really make a difference for you and your mom - there is definitely hope! You can feel better and have a better relationship with your sister.
Is your sister diagnosed with BPD? Is she in therapy?
Here is a link that may be helpful for you at the moment:
The Do's and Don'ts for a BP relationshipHang in there, things can get better. We are here to support you. Keep writing, it helps!
heartandwhole