Cecily von Ziegesar’s half-brother Peter finalized a deal with St. Martin’s last week to write an as-yet-untitled "family memoir." According to a posting on the Publishers Marketplace deal-wire (sub. required), the book will cover the childhood Mr. von Ziegesar spent living in the "wealthy and privileged enclaves of the northeast" and the relationship he had as an adult with one of his step-brothers, a homeless schizophrenic also named Peter.
According to the author’s literary agent, David Kuhn, Mr. von Ziegesar’s memoir will not be about his famous Gossip Girl-creating half-sister Cecily any more than it will be about any of the 50 secondary characters that will populate the book.
In a February 10, New York Times profile of Mr. von Ziegesar’s family that ran in the Real Estate section, Celia Barbour called Mr. von Ziegesar a "freelance writer and filmmaker" and reported that he grew up in New Canaan, Connecticut, "in a household of 13 siblings, stepsiblings and cousins."