I see you have answers to your query in the Norway forum, so I suggest further responses be consolidated there.
Also a rootsweb message board has a discussion of this Hans -- Hans Johnson Solpestad -- and you'll want to also combine that information into the thread on the Norway forum. I would do it for you but I'm getting an "error" message when I try to post it!
I note that the 1870 census record has not been found. Hans (or Hans and Marie) could be listed under the surname Johnson.