????
                     Luxem, Robert (b:)(d:)
                    |          ????
           Luxem, Richard Paul (b:1943)(d:2019)
          |         |          ????
          |          Bulgrin, Mae (b:)(d:)
          |                    ????
 Luxem, Robert John (b:1977)(d:)
          |                    ????
          |          Unger, Frank William (b:1915)(d:1979)
          |         |          ????
           Unger, Barbara Julia (b:1945)(d:2021)
                    |                              ????
                    |                    Christensen, Christen (b:)(d:1876)
                    |                   |          ????
                    |          Christensen, Martin (b:1870)(d:1957)
                    |         |         |          ????
                    |         |          (unknown), Anna (b:)(d:1874)
                    |         |                    ????
                     Christensen, Grace Margaret (b:1920)(d:2005)
                              |                    ????
                              |          Frederickson, James (b:1846)(d:)
                              |         |          ????
                               Frederickson, Sophia M (b:1881)(d:1974)
                                        |          ????
                                         Anderson, Margaret (b:1854)(d:)
                                                   ????