Hi Jules354

Sorry to hear you are having these difficulties in your relationship with your sister. It is sad and unfortunate when we have close family-members who for whatever reason are difficult to get along with.
I am trying to explain the different reasons why my sister feels such anger towards me but when I feel like it is raking over petty reasons but I will bullet point to provide an overview:
- I ruined her wedding.
- I hurt her by not having her children to the evening meal at our wedding breakfast.
- I am jealous of her
- our mother loves me more
The first two points I could of dealt with things differently and with hindsight I would have changed a few decisions as the fallout has been so great for our family.
Hindsight is 20/20. We all make mistakes. It's always easier to have all the right answers after the event has already happened, much harder when you are right in the middle of it though. Dealing with someone with BPD can be quite tricky and none of us are born with the knowledge and skills necessary for this. We learn this as we go along, often through a process of trial and error. Once we know better, we can do better.
I am curious though if you genuinely feel that you did anything wrong back then or is it mostly because of the consequences those events have had that you now say you would have done certain things differently? What would you have done differently looking back at these events?
The latter points I cannot address but I do refute them.
People with BPD often struggle with distorted thinking and distorted perceptions of reality. It could very well be that in your sister's mind, her statements/accusations are very valid. What does your mother say about your sister's behavior?
I am sorry that your father almost died this year, that must have been a tough period for all of you. How is your dad doing now?
I am conscious I have a part to play and I just want to try and understand how to behave and some pointers so not be active in the drama triangle. I feel by not engaging in conversations regarding situations where we both have made mistakes is not fuelling the fire but the fire just keeps burning.
I think it's positive that you are able to acknowledge how your own behaviors/responses might be contributing to the problems in your relationship with your sister. This is something people often find difficult to acknowledge, but I think it is very important though. We cannot change or control the other person, but we can control our own behavior, specifically our responses to the BPD person in our lives. We have an article here about things we ourselves can do to end the cycle of conflict, I think you might find it interesting:
Ending the Cycle of ConflictI encourage you to keep posting here and also to read other members' stories. We have many members here with BPD siblings and I think you can benefit from reading their stories. Take care and welcome to our online community