Dorothy Hammerstein spouses to marry in 1929. Oscar also had two children from his first marriage: William Hammerstein and Alice Mathias. His marriage to Dorothy lasted until his death in 1960. They had a son together, James Hammerstein. Between the 1930s and the 1950s she operated Dorothy Hammerstein Inc, a high-profile interior design business, with clients on both coasts of the United States. In 1949, along with her husband and the novelists Pearl S. Buck and James A. Michener, she was a founder of Welcome House, an organization that facilitates the adoption of children of American and Asian parents. From its inception
Kurt von Hammerstein-Equord the aversion of Hammerstein against political extremism and military risks. Hammerstein-Equord was loyal to the Weimar Republic, a close friend of Kurt von Schleicher Hammerstein worked out first tactical concepts for the army in the Truppenamt. They provided for a sustained defense in an attack until the League of Nations would intervene. In contrast, 1930 was created under his direction the first mobilization plan since 1923, which scheduled the tripling of the seven Infantry Division to 21. In 1930 he was appointed Commander-in-Chief of the Reichswehr, replacing General Wilhelm Heye. Schleicher (now defense minister) with support from Brüning made Hammerstein