How Family Is Psychopaths

My sister killed my mother, stabbing. We're trying to figure out how family is psychopaths. I would never hurt anybody unless I was acting in self-defense. Did you have a good relationship? What the bad? When my sister was a child, irrelevant. Is this a Dad in childbirth situation? My sister survived childbirth. No, but... did you have mother survived the birth of your sister? And she was stabbed. That's metaphorical, I don't know.