I've got the picture from church Congregation. Thank you very much for all help an information.
My granma and the children move bach to Norway in 1939 and grandpa should work some few more years. He came back to Norway in 1945.
Dads oldest brother move back to ND and married up there. My Aunt and a cousinof mine lives in ND today.
In Norway its free to look into diferent digital achives. Her is a link where you can search for people in all databases in the National Digital Archive (Digitalarkivet) http://www.digitalarkivet.no/cgi-win/WebMeta.exe?slag=vismen...
There its possible to search through a lot of people. If you know the given name and birth date and year, you may be able to locate them to fewer people. Then it's possible to look into the church records (scanned pictures for every year) at the same archive and to check for the correct birth date.
So as I said just send me all information you know and I will try to help you.