????
           Majer, David Glen (b:)(d:)
          |          ????
 Majer, Michael E (b:1983)(alive: 2025)
          |                              ????
          |                    Callahan, John Fielding (b:1889)(d:1959)
          |                   |          ????
          |          Callahan, Edward Francis (b:1922)(d:2004)
          |         |         |                    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:)
           Callahan, Carol A (b:1962)(d:)
                    |          ????
                     Arnold, Ida (b:1924)(d:2001)
                               ????