Usually, when Anderson Cooper is interviewing someone, he’s revealing a lot more about his subject than he is about himself. Not this time. Not when the person he’s interviewing is his mother, and not when his mother was, for a brief time, one of the more famous people of the early 20th century: the “Poor Little Rich Girl” at the heart of a bitter custody fight between her wealthy and high-profile parents. So when he interviews her – or talks to her, really – we learn a lot about both.