????
           Callahan, John Fielding (b:1889)(d:1959)
          |          ????
 Callahan, John Albert (Jack) (b:1921)(d:1996)
          |                              ????
          |                    Dorau, Christian (b:1802-1836)(d:)
          |                   |          ????
          |          Dorau, Albert Frederick (b:1861)(d:1951)
          |         |         |          ????
          |         |          (unknown), (unknown) (b:)(d:)
          |         |                    ????
           Dorau, Emma Bertha (b:1894)(d:1988)
                    |                    ????
                    |          Heyer, August (b:1820-1821)(d:)
                    |         |          ????
                     Heuer, Paulina (b:1864)(d:1907)
                              |          ????
                               Tesker, Henryeta (b:1818-1819)(d:)
                                         ????