Looking for Johan Stokke - Agnetta Stokke

Hello: Looking for information on Johan A Stokke and his daughter Agnetta. I have a little information about my grandmother. She was "born 1856 in Gjovik." She married Peter Brynildson in Vang North Dakota, USA in 1886. She is buried in Govan, Saskatchewan, Canada. Agnetta had 4 children that lived: Hendrik, Josephine, Amelia and Gyda. Johan is born in 1829 Norway and his wife's name was Josephine(?). HIs wife did not come to America, so possibly died before he immigrated. His children born in Norway were Ingeborg, Agnetta, Andrew, and Edward. Any help would be appreciated.