Anders and Andreas were brothers, sons of Anders, with the patronymic last name of Andersen. They grew up on the Flansås farm near Evanger, Norway, and both came to the United States and began using the first name of Andrew. The ship manifest had recorded their last name as Flansaas, and that is the last name they both went by for some time. About 1910, probably due to the confusion of such similar names, Anders began using the last name Andersen, his surname in Norway, and Andreas continued using the last name of Flansaas.

1900 Census, Norway
Flansås, Evanger, Evanger, Sondre Bergenhus amt, Norway
1 Anders Andersen Flansås 1863 Evanger herred Hf g Husmand m J og Murarbeider Gaardbruger b [Smallholder Farmer, Masonry]
2 Brita Andersdatter 1853 Evanger herred* Hm g Husmandskone Gaardmandskone [man wife] b
3 Anders Andersen 1889 Evanger herred* S ug Søn b
4 Andreas Andersen 1890 Evanger herred* S ug Søn b
5 Nils Andersen 1891 Evanger herred* S ug Søn b
Farm Flansås Parish Evanger

Emigrants from Bergen 1874-1930
Anders Anderson Flansaas
Year of birth: 1889
Age: 20
Birth place: Evanger
Residence: Evanger
Position: ug Gårdsarb Farm worker
Date of emigration: 29.03.1909
Port of departure: Bergen Norway
Destination: Amk Lake Preston So Dak
Ship Line: Cunard
Reason for emigration: a bedre fortj [better life]
New occupation: Farmarb
Remarks Reiser til bekjente [Traveling to acquaintences]

1910 United States Census
ED 256, Baker Twp, Lake Preston City, Ward 1st, Kingsbury, South Dakota
Dwelling 140 Family 140
Julius L Haugslien Head 41 Norway
Marie Wife 42 Norway
Agness Daughter 14 Norway
Engvald R Son 11 Norway
Seger C Olson Roomer 23 Norway
Anders [Andreas] Flansaas Boarder 20 Norway Immigration 1910 Laborer
Andrew Flansaas Boarder 22 Norway Immigration 1909 Laborer
Jacob Larson Boarder 21 Norway
John Field Boarder 19 Norway

United States World War I Draft Registration Cards, January 5, 1917
Andrew Anderson, age 29, of Lovejoy, Montana, whose occupation is Farming
Born 5 Feb 1889 Evanger, Norway
Naturalized citizen
Registered at Phillips County, Montana

1920 United States Census
School District 9, Wheatland, Montana
Andy Anderson 31 Norway, Can read and write, Property Owner, Birth Year (Est) 1889
Immigration Year 1909
Father's Birthplace Norway
Mother's Birthplace Norway

Per family records, Andrew Andersen married Clementine Ona Killough.

1930 United States Census
Harmanson, Phillips, Montana
Andrew Anderson 41 Birthplace: Norway
Ona Anderson Wife 35 Missouri
Ross Aarhus Lodger 21 Norway

Montana, Death Index
Andrew Anderson 48
16 Sep 1937
Birth Year (Estimated) 1889
Index Number Phil 1032

Ona, Widowed, and children are found on the 1940 census living at the same home. Andrew is most likely buried near Harmanson, Phillips county, Montana where he was living before he died, and where his family continued to reside after his death.

Children:
James M. Anderson (1931 - 1996)
Vida Anderson Martin b. about 1930 d. before 1996