Hi
TGS 
Welcome to the Family!
I'm so sorry for what you've been going through with your daughter - explosive episodes, threats of suicide, irrational accusations, alcohol, it's so much to deal with,
how are you holding up? I'm glad you've found us and reached out for support, we are here for you - you are not alone.
Some of our members are also grandparents and many will relate to what you have shared, myself included We know how difficult it is to navigate a relationship with an adult child with BPD/BPD traits - throw in some grandchildren and it becomes even more trying, exhausting.
After a gut wrenching explosive event with our daughter resulting in filing a police report and calling DSS concerning our grandson
What happened? Is there an open case with DSS? How are you all coping?
Sorry for all the questions - it helps to get a good picture of what's been going on so we know how to best advise you. There are no pat answers, but there are things we can do to help us cope, end the cycle of conflict, and improve our relationships.
My advice is to learn all you can about BPD (we've got a lot of articles, dive in at your own pace), take care of yourself as best you can, and keep coming back. We are all here for you, for each other, we get it.
In case you missed it, there's a thread pinned to the top of this board with links to some of the best articles - it's a good place to start and you can come back here to ask any questions at all. Here's a link:
HOW TO GET THE MOST OUT OF THIS SITE I look forward to getting to know you, and how we can best support you - again, welcome!
~ OH