In the 1920 census, Albert and Viggo are listed with their father in Rockford Township, Renville County, North Dakota. Carl was a farmer and listed 1892 immigration. The Ditlev Lund family had the neighboring farm.
Here is Carl's Danish registration for emigration:
Name: Bruhn, Carl Occupation: Arbejder
Age: 24 Destination: Sullwater, Minn.
Contract no.: 214800 Registration date: 3/30/1892
Birth place: ? Birth place: ?
Last res. parish: Rødby (Lolland) Last res. county: Maribo
Last residence: Rødby, Maribo Destination country: USA
Destination city: Stillwater Destination state: Minnesota
Name of ship: Indirekte
Carl Bruhn 24 arrived Halifax 16 April 1892 on the ship Mongolian from Liverpool.
He is listed with the family of Christian Bruhn 29 and wife Kirstine, children Theovald and Arthur.
All show Stillwater, Minnesota as destination.
Christian was Carl's older brother Rasmus Christian Bruun, born 19 Apr 1863 Rødby.
In 1900 the family was listed in Polk County, Wisconsin:
Christ Brown, Apr 1863 Denmark
Christine Brown, Dec 1860 Denmark
Tovel A. Brown, Feb 1886 Denmark
Arthur P. Brown, Mar 1888 Denmark
Engolf Brown, Jun 1897 Minn.