I am researching the Hjertstedt line for my husband. His name is Gary Stai; mother: Esther Hjertstedt 1927-1989; grandparents: Knute Otto Ferdenand Hjertstedt 1896-1967 of Sweden and Ingrid Lindfors 1894-? of Finland; great grandparents: Peter M. Hjertstedt and Clara Carlson. Appreciate any information on either side.