????
           Dykstra, Warren (b:1965)(d:)
          |          ????
 Dykstra, Mathew Robert (b:1991)(d:)
          |                                        ????
          |                              Janssen, Johann Seims (b:1846)(d:1931)
          |                             |          ????
          |                    Janssen, John Gerhard (b:1885)(d:1971)
          |                   |         |          Ricklefs, Ricklef Mathies (b:1814)(d:1882)
          |                   |          Ricklefs, Elise Friederike (b:1851)(d:1923)
          |                   |                    Johnson, Elizabeth (Lizzie) (b:1812)(d:)
          |          Janssen, Robert F (b:1927)(d:2007)
          |         |         |          ????
          |         |          Janssen, Elizabeth W (b:1893)(d:1962)
          |         |                    ????
           Janssen, Karen Beth (b:1962)(d:)
                    |          ????
                     Wagner, Kathryn (b:1927)(d:)
                               ????