Sivert and Ragnhild Bak

I have a picture of Sivert J. and Ragnhild Hjelanes (Gelen) Bak with their children, and I am trying to identify the children. Sivert (1849-17 Mar 1931) and Ragnhild (1855-4 Nov 1913) emigrated in 1881 from Aure kommune (Møre og Romsdal) via Trondheim with the "Tasso". They settled in Minnesota, probably in Spring Valley. There appear to be 9 children in the photo, 4 young women and 5 young men. I have the names of some of the children: Ole, Karen (b. 1880), Jon (b. 1881) and Fredrikka (29 Jun 1883-Oct 1978). Fredrikka married Iver Øien, and this family settled in Longview, WA. I would appreciate any information about this family! Perhaps someone has access to the census for 1900 and could find this family there.