Hi Debsis,

I'm sorry to hear this. It sounds really tough for you. Although the person with BPD in my life is my mom, I do know the effects of denigration campaigns and having family and friends turned against you.
I'm glad you're here, because I know there are people who have been through similar and can relate. You're not alone here. How much contact do you have now with your sis? Sending much caring and support to you.