????
           Martens, William Carl (b:1860)(d:1932)
          |          ????
 Martens, Julius Albert (b:1907)(d:1976)
          |                    ????
          |          Krueger, Gottfried (b:1825-1826)(d:)
          |         |          ????
           Krueger, Augusta Amalia (b:1866)(d:1954)
                    |          ????
                     (unknown), Henriette (b:1834-1835)(d:)
                               ????