Gudbrand Hansen and Severine Haldorsdatter were married in Biri parish, Oppland, on 10 Apr 1864.
They left for America with their children on 10 May 1882http://digitalarkivet.no/cgi-win/webcens.exe?slag=visbase&am...
Here they are in the 1865 census, living at the farm "Lundvolden mittre":http://digitalarkivet.arkivverket.no/ft/person/pf01038066002...
Their first three children were born at the farm "Sigstad", in Biri:
Hanna Marie, 1 Nov 1866
Martha, 4 Oct 1868
Hans, 30 Mar 1871
I haven't looked to verify further dates.