Neither being an expert, but based on readings, there is more and more evidence that BPD is genetically transferred. I found 42-48% (can’t find the source)
Again based on, it can be dormant, not visible, until triggered by an event.
Further there is the part of upbringing, a learned aspect within the family, if you wish.
www.ncbi.nlm.nih.gov/pmc/articles/PMC3268672/www.trace.tennessee.edu/cgi/viewcontent.cgi?article=3544&context=utk_gradtheswww.web.utk.edu/~macfie/jenny/docs/documents/SRCDHandout_maltreatment_.pdfWith a rather confronting title, but written by a psychologist:
www.patch.com/california/malibu/bp--how-mothers-spread-borderline-personality-disordeed7a820675I see it in exw (HF but turbulent in personal relations), no cutting, however in her younger days wearing a very tight leather bracelet (hurts when it shrinks as it dry up… “you know, then I really feel myself”…)
Anyway, exw mother, sisters and brother with many traits, their uncle (brother of their mother) and grandma. Summarising: 10yrs psychological treatment, unable to hold jobs for a longer period, emotional breakdowns, alcohol abuses, into a rehab clinic.
And according to me, it is inherited by my daughter too, who I lost during the process.