Johan Arnt Hansen Skaret

Johan is my great grandfather who immigrated from Norway in either 1892 or 1893. I have no idea what the dates are but I do know he did move to Mason, Wisconsin. His family followed him in 1894. I have no idea on how to find their dates of arrival or the ships that they came over on. When he got to america he changed his name if John Arnt Hanson. Debbie