My mother-in-law has histrionic personality disorder. When relatives visit, she busies herself around the house, occasionally exposing her bruised, purple arms and telling them I pinched her because I was in a bad mood. When she goes for a walk and chats with the neighbors, she always cries and says I starve her at home. So I started putting on a show of my own. I helped her take her acting to the next level, so everyone could see just how well this old woman, who ought to be competing for an Oscar, could put on a performance.