Apparently it ran in the family, on my mom's side. My great-grandmother had a sister named Ethel, whom they kept locked in a small stone outbuilding behind the main house. She was something of an escape artist, and when she did get out, she'd invariably attack somebody, usually a child. My mom was attacked by her.
Ironic, because my mom developed it. She had a nervous breakdown in her late teens, but the real breakdown came in the mid-1970s, when I was a young teen. I had a really hard time dealing with her abuse. Finally, she was locked up for a few months, only to emerge a withdrawn shell of her former self, heavily medicated, doing nothing. Even though I was only thirteen, I had to assume care of my younger brother, grocery shopping, and cooking the meals.
My parents tried to hold it together, but they divorced in 1979. My brother and I stayed with my mom. Life with her was a rollercoaster, with her going on and off her meds. When my younger brother (who was autistic) turned 18, the last of the child support ended, and this change to our economy meant that my mom could no longer afford to see the doctor who had kept her semi-stable for so long. She shifted to county mental health, MHMR, which put her on different, less effective meds. Therapeutic advice differed as well; they advocated that she go out with friends and socialize. This led her to go out drinking with co-workers at local bars, and alcohol is completely inimical to psychiatric drug therapy. They also thought it would be healthier for her to pursue life independent of her kids, so she threw me out of the house (although I had up to that point functioned as the stabilizer, keeping both her and my autistic brother going). I moved out, and things really went to hell for them.
My brother, a barely functioning autistic, decided one night in 1995 to go looking for a local titty bar. Although it was only a few blocks away, he couldn't find his way out of a paper bag, much less navigate driving. Somehow he wound up in a rural area, pursued by violent drunken rednecks, who chased him through a ditch and a barbwire fence, out into a field where the truck, barbwire wound around its wheels and driveshaft, came to rest. They beat the glass out of the windows, dragged him out of the truck, and were in the process of beating him to death when the police showed up and put a stop to it. One of them had beaten him with a tire iron, and he had sustained severe head trauma.
Perhaps three weeks later, he began acting oddly, ducking behind things when cars passed, and claiming that people with cell phones were phoning in his position. Adult-onset paranoid schizophrenia was the diagnosis, with the additional kicker of 𝑎𝑛𝑜𝑠𝑜𝑔𝑛𝑜𝑠𝑖𝑎, that he would not or could not admit that he had a mental illness. Nor would he accept treatment for it. He became almost a greater problem than our mom who, in 1998, drank antifreeze and died. I moved back home and assumed care of my brother, and here I've been ever since.