????
                     Martens, William Carl (b:1860)(d:1932)
                    |          ????
           Martens, John F (b:1895)(d:1980)
          |         |          ????
          |          Buchholz, Louisa Augusta (b:1864)(d:1897)
          |                    ????
 Martens, Donald (b:1923)(d:)
          |          ????
           Henchen, Frieda (b:1892-1893)(alive: 1930)
                     ????