It seems to me that if you take a psychologically healthy young mother and her psychologically healthy children and suddenly subject them to overwhelming trauma, as happened to a friend's mother in Germany in the thirties, you have a good chance of producing PTSD in the mother and any of the personality disorders in her children, as well as "attention deficit". You could also get "organic" mental illness like bipolar and schizophrenia. Which pd the kids get will depend on personality traits, genetic predilections and age of trauma.

A lot of people prefer to have PTSD rather than BPD for a variety of reasons, among them that no one really wants to think about having been traumatised as a dependent little child.

Go with the diagnosis you are given. Each category is only a constellation of symptoms and traits. The categories are manmade, just conveniences. Good practitioners know that borderlines are frozen in overwhelming toddlerhood in the same way ptsd is frozen in overwhelming adult trauma. Bad practitioners...get away from them. But give each dx and treatment a try. Bpd isn't the diagnosis of doom some borderlines imagine it to be. It's not a greater defect than PTSD which implies an underlying weakness unbefitting adults. Says me with chronic ptsd.