Esther Pauline Friedman Lederer is the twin sister of Pauline Esther Friedman Phillips. And Esther’s daughter is named Margo Howard.
Of course, they’re all best known by other names. Esther is best known as Ann Landers. And Pauline’s best known as Dear Abby. That they’re sisters in real life is fairly common knowledge. But the fact that Margo Howard is the writer of Dear Prudence, Slate’s advice column, would seem to indicate that nepotism goes a bit too far in the advice industry. (Particularly since Prudence, well, isn’t all that good.)