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
Kurt von Hammerstein-Equord by the "Reichskriegsflagge" with the swastika. Thus, he was buried at the family's graveyard in Steinhorst, Lower Saxony. Hitler ordered the sending of a wreath with a message of condolence, but the wreath was not on display at the funeral because it had been "forgotten" in the Berlin subway by Hammerstein's family. Heinrich Brüning, leader of the Catholic Center party, who served as German chancellor between 1930 and 1932, called Hammerstein-Equord "the only man who could remove Hitler — a man without nerves". According to the reminiscences of his son Kunrat von Hammerstein, Hammerstein-Equord resigned from the Club of Nobility