Hi Gre82,
I wanted to join
Wools and welcome you to the BPD Family
I'm sorry you all are struggling with your sibling's behaviors and issues, but know you are not alone all of us here have someone in our lives with either BPD or BPD Traits... .we "get it".
Can you expand a bit on your situation? Has your sibling been officially diagnosed or are you like me and the shoe just fits? Does your sibling live on their own or still with a parent(s)? How about you are you still at home or out on your own? Is anyone seeing a Therapist at all? (you/your parents for support or your sibling to help manage her issues?) What is the issue with your sibling that is most difficult at the moment? Okay enough of my questions

Just trying to get a better feel for your situation.
I wanted to point out the "Lessons" section in the box to the right --> Just click on a topic and it will link you to further information that you might find helpful.
Again Welcome, I'm glad you decided to jump in and post it's always nice to add a new voice to the group.
Take Care,
Panda39