My dad is BPD+, and I'm not changing details, because I was a child and did nothing wrong.
Going NC with him and his entire family fifteen years ago was really hard for me, I looked up to a lot about my dad and he made me feel special and loved, but I couldn't keep ignoring how much he hurt most everyone around him all of the time, and how much he ignored of how his wife treated me.
I feel incredibly redeemed today that I made the right decision - he is going into retirement facing possible incarceration for the 4th or 5th time (I'm unsure, he has ASPD as well so truth isn't really a thing with him but I know of at least 4 bench trials), this is the second time in less than five years.
My uBPD stepmother really put me through the ringer, their children were young (and golden) when I was last there so I'm not sure about them. But she would violate boundaries (she literally held up my training bra when I was 12 to a friend to have them mock my size), humiliate me, bully me, lie to my dad about disgusting things I'd supposedly done (told him I was leaving menstrual blood everywhere when I hadn't started having a period yet as an example, see that training bra above... she was intentionally leaving soiled paper upright in the bin and making messes in our guest powder room and I'm still not sure if my dad believed me or not), and she loved doling out physical punishment with a belt or a strong slap across my face for every single offense, real or otherwise.
So much of what I internalized as "stupid" and "wrong with me" because of her careless and unending criticisms as a young teenaged girl was actually just undiagnosed fucking autism - such as interoception about hunger, bathroom and temperature.
Being told I "got what I deserved" while dry-heaving and tremoring in a public bathroom at age eight because I was hungry but couldn't force food from sensory issues and anxiety kinda made me feel like she got what she deserved while my dad strangled her because she wouldn't stop bringing up his custody agreement with my mom. I know she didn't deserve it and I didn't either, but one of us chose my father, and it was not me. Instead of using her energy to fix her own life and improve her children's, she just used me as a punching bag with a face vaguely like her husband's.
He just filed for divorce against her after she pressed charges and filed a civil suit against him, over thirty years into them slugging it out on a regular basis. The other recent charge was unrelated to her, but seemed to be violence with an unrelated woman - possibly affair partner. The riddance was good.
(thank you for the space to get this off my chest. I know about these things from searching for his future obituary - serious mental illness reduces lifespans so we are getting there fast now. I want to mourn him, for his childhood, and for me and the children I did not have when he departs.)
peace and stillness found
safety is a sacred place
love walks on all fours