Hi Rebecca,
Can you describe the frightning behavior a little?
My step daughter is 26 and we suspect has BPD. She has cut us off from her children, they are 1 and 3. This hurts a lot, but we are coping pretty well. It has been a year since we had any contact.
Basically, my husband describes a pattern of not ever getting along with people, from teachers to classmates to her own bio mother, when she was younger. She had a new best friend every 2 weeks. The person goes from being put on a pedastal to being the worst person ever.
This is sort of what happened with her and I. Although, I must have missed the pedastal part!
She has an older sister, and is very jealous of her. They constantly vie for their Dad's attention. When I met and eventally married their Dad, at first, they were both trying to impress me. That didn't last long, however, because mostly they view me as competition now, I think. They are in an alliance against me, and have made that clear to their Dad.
Anyway, would love to hear more if you care to share more.
b