Hi Laurie Nancy Drews here. I have never found were the Rohlf name was changed to Wulf. I went to the Chisago county courthouse last week and verified Chatarina death as Nov 1884 in the records. I also have immigration records showing John Rohlf and family coming over on the same ship as Hans Drews and son Joachim (later known as Fred J Drews). This coincides with the rootdigger account for Chatarina Rohlf as being married to Hans Drews and being a brother to John Rohlf. My genealogy has been changing as I verify through actual records. I now know that Frederick Drews born 1853 was married twice but that children Mary and Fred were actually adopted from his 2nd wife Mary. His first wife was Louisa Lange (courthouse marriage records). I can not connect the Drews and Wulf anywhere. Let me know if you have anything different.