Hi WannaBhopeful and

You've chosen a great name, all about hope.
I'm so sorry for the sadness and grief you are going through. Please know that when dealing with a BPD, it has nothing to do with you or the things you've done. They are unpredictable.
There are many great resources here, and lots of help and understanding that will be offered. You are among friends who will listen and grieve with you and offer ideas of hope.
From the time I was 12 years old until I was in my 30's, I lost nearly all contact with my grandpa, aunts, uncles, and cousins because my uBPDm forbid us from talking to them or visiting them. To make it worse, my grandpa (and grandma who died a few months after 'the ban' lived only 1 house away on the same farm. For all those years, even as an adult, I lived in fear of my mom finding out if I ever did have contact for she often informed me that I was betraying her if I ever saw them. I think my own unsureness and not knowing who to trust kept me away even though my uBPDm lived far away. It's the old isolation technique of BPDs. I feared my children's letting the cat out of the bag and saying we had visited, so I rarely or never visited. Now that I'm back in contact with my family and learning who they are, I grieve so incredibly for all the lost years. Thankfully I spent many a good day with my grandfather and my children got to know their great grandfather before he died at 98. Those are memories I cherish now.
Know that in time those grandchildren will be able to make their own choices, and the unconditional love and support you show them will help them through the waters they won't know how to navigate.
Woolspinner