The Whole Family, a novel by twelve authors

According to Wikipedia: "The Whole Family: a Novel by Twelve Authors (1908) is a collaborative novel told in twelve chapters, each by a different author. This unusual project was conceived by novelist William Dean Howells and carried out under the direction of Harper's Bazaar editor Elizabeth Jordan, who (like Howells) would write one of the chapters herself. Howells' idea for the novel was to show how an engagement or marriage would affect and be affected by an entire family. The project became somewhat curious for the way the authors' contentious interrelationships mirrored the sometimes dysfunctional family they described in their chapters. Howells had hoped Mark Twain would be one of the authors, but Twain did not participate. Other than Howells himself, Henry James was probably the best-known author to participate. The novel was serialized in Harper's Bazaar in 1907-08 and published as a book by Harpers in late 1908."