Thore Bottem Family

I am looking for info. on the Bottem Family. Thore Bottem was born 9/28/1845 in Norway, he married Gunhild Sather in 1878 in Cottonwood County, Minnesota. They moved to Holt, Marshall County, Minnesota in 1906. He died 3/13/1916 in Excel Township, Marshall County, Minnesota. I have info. on their children, but no more info. on where Thore came from or who his siblings or ancestors were. Any help would be greatly appreciated.