James Hammerstein had one child (Oscar Andrew) with his first wife Basia, two children (Will and Jennifer) with his second wife Millette Alexander and one child (Simon) with his third wife Dena (Geraldine Sherman). He died in Manhattan after suffering a heart attack. James Hammerstein Hammerstein was the son of Oscar Hammerstein II, and his Australian-born second wife, Dorothy Kiaora Blanchard. He had four half-siblings, two through each of his parents' earlier marriages: William and Alice Hammerstein, and Henry and Susan Jacobson. The best known of these was Susan, whose husbands included Henry Fonda and Richard Widmark. Hammerstein attended George School in
Oscar Hammerstein II Kern, with whom Hammerstein enjoyed a highly successful collaboration. In 1927, Kern and Hammerstein had their biggest hit, "Show Boat", which is often revived and is still considered one of the masterpieces of the American musical theatre. "Here we come to a completely new genre — the musical play as distinguished from musical comedy. Now ... the play was the thing, and everything else was subservient to that play. Now ... came complete integration of song, humor and production numbers into a single and inextricable artistic entity." Many years later, Hammerstein's wife Dorothy bristled when she heard a remark that