My stepmother is reckoned by the family to be suffering from paranoia, but she's never seen any sort of doctor about it as far as I know. She thinks MI5 are spying on her. Won't turn on the TV because MI5 can use it as a camera to look at her. Convinced that the postman and neighbours are in on it. Her daughter, my half-sister, is reckoned by me to be paranoid about misogyny. She sees it when it's not there. Has completely irrational responses to innocent remarks and explodes with anger. She's had a series of bitter fallouts, six that I know of, including two of her oldest and best friends, who she used to adore, plus three neighbours, and me. Her fallout with me was followed by two years of silence, then justified by saying that it was my fault and I had it coming to me, but she regretted that I'd been hurt by it. She's had treatment for depression in the past. She used to do coke on nights out. She says she's changed a lot, but frames it as personal growth, 'not taking any shit any more'. Some of her friends can't deal with it, 'but that's their problem'. I doubt she'll ever have any insight into whatever is wrong, or ask for treatment. I used to think of her as my best friend, but now I view her as a sort of cross between an alien and a hand grenade. She's a stranger to me. Her true personality doesn't really exist for me any more. I go along with a superficial, polite friendship for the sake of my brother and his kids.