I think the way to solve this is by finding more info on Nikolai Asmervig. He was living in Ballard, Washington when Severine arrived in 1905. At some point he left for Canada, returning to Washington in 1922. There was also a Cornelius Nilsen Asmervig living in Ballard, Washington.
Cornelius arrived in America in 1882, Nikolai in 1888.http://digitalarkivet.no/cgi-win/webcens.exe?slag=visbase&am...
They came from a large family and many of their siblings came to America also.
Birth of Nikolai:
Born 19 Aug 1866
Father: Nils Hansen Asmervig
Mother: Elen Marie Ommundsdatter
Kildeinformasjon: Rogaland fylke, Rennesøy, Ministerialbok nr. A 6 (1860-1878), Fødte og døpte 1866, side 37.
Permanent sidelenke: http://www.arkivverket.no/URN:kb_read?idx_kildeid=6307&i...
The family living at Asmervig in 1865:
(Before the birth of Nikolai)http://digitalarkivet.no/cgi-win/webcens.exe?slag=visbase&am...
Berthe and her husband are running the farm in 1900. Her parents and one brother are listed at the bottom of the page:http://digitalarkivet.no/cgi-win/webcens.exe?slag=visbase&am...