Hi emelina
Welcome to bpdfamily and thanks for posting this introduction
BPD is a difficult disorder to deal with but now that your sister has been diagnosed, you at least know what you're dealing with. When exactly was she diagnosed and what led up to her being diagnosed? Is your sister getting any targeted treatment to help her better manage her BPD?
Communication with a BPD family-member can indeed be quite challenging. However, there are certain techniques that might help you improve you communication with her. I suggest you start by taking a look at some resources we have here about validation and things you can do yourself to 'end the cycle of conflict':
The Importance of Validating OthersA 3 Minute Lesson on Ending ConflictHere are some excerpts from the article about validation:
When it comes to emotional intelligence, one of the most advanced skills is knowing how to better validate others. Validation opens people up and contributes to the feeling of comfort and safety when communicating with you. Conversely, if you are experiencing a communication breakdown, if there is a wall between you and someone else, it most likely has been built with the bricks of invalidation.
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Nowhere is the communication skill of validation more important than in interfacing with highly sensitive individuals, individuals with low self esteem or individuals who are easily intimidated. This is a very valuable tool for dealing with people with Borderline Personality Disorder.
To validate someone's feelings is first to accept someone's feelings - and then to understand them - and finally to nurture them. To validate is to acknowledge and accept a person. Invalidation, on the other hand, is to reject, ignore, or judge.
Validation of feelings is vital to connecting with others. The mutual validation of feelings is important in all phases of relationships including building, maintaining, repairing, and improving them.
Your sister has been diagnosed, do you feel that she acknowledges and accepts this BPD diagnosis? Does she acknowledge that there might be something wrong with certain aspects of her behavior?