Is this borderline behavior or just neglectful?
When I was a child I spent countless hours at a friend's house down the street. Spent the night multiple times. The mom used to pick us up from school as part of a carpool situation. When, as an adult, I remembered some odd things about their home life, my mother said "yeah I think she may have had a drug problem." I cannot imagine letting my children spend unsupervised time with someone with a drug problem. Especially if she was going to be driving.
I also found out that my mother knew that my uncle by marriage had at least attempted to molest my younger aunt, and years later as a child allowed me to spend the night at that uncle's home with my cousins (nothing happened).
Please help me work through this. Is this related to both of my parents BPD and my mothers histrionic tendencies or is this a separate problem?