Hi oldersister34,
Welcome to the BPD Family

I’m glad you’ve found us and decided to jump in and post.
I already see some good things going on from what you’ve posted. Your sister has been diagnosed, so this issue has been identified, is out in the open and now it can be worked on. The fact that she is seeking help and going inpatient to get it is terrific.
Another good thing about there being a diagnosis is now the rest of the family knows the name for what is going on and can now work to both learn about BPD…what it is, understand the ways it can affect your sister and by extension how it affects the family. Once you know what it is you can both support your sister in more effective ways and protect yourself from some of the more difficult behaviors.
When I first found out about BPD I hit the local library and started reading everything they had on the subject.
Two particularly good books on BPD that I liked are…
Overcoming Borderline Personality Disorder: A Family Guide for Healing and Change by Valerie Porr
and
Stop Walking on Eggshells: Taking Your Life Back When Someone You Care About Has Borderline Personality Disorder by Paul Mason MS & Randi Kreger
I’m with
Harri on the Validation, I think that is an excellent tool that you can start learning more about and implement from a distance. The kind of validation we are talking about here often isn’t just about validating good/positive behaviors although that type of positive reinforcement is good too. Much of the validation we do with someone with BPD has more to do with validating feelings. This doesn’t mean we validate a bad behavior but it’s more about validating a feeling that brought on the behavior or behind the behavior.
I want to add this link to what Harri has already provided, it has examples of validation…
https://bpdfamily.com/message_board/index.php?topic=124001.0Will your family be seeking any therapy around your sister’s new diagnosis? That could be good for all of you, but particularly for your dad. Enabling doesn’t help we all learn from the consequences of our actions and preventing them doesn’t allow your sister to learn. That said as a mom I can empathize with your dad…she’s his daughter…and it’s really hard to watch your kid struggle.
We have a board for the Parents of BPD children if either of your parents are interested.
I hope you’ll keep us posted on your story. Again welcome!
Panda39