Haugen

I am looking for information on Haugen's that lived in Grant County, Minnesota USA. Ole & Martha (Ervik) Haugen lived in Stony Brook Township or Hereford, Grant County, Minnesota in the late 1800's. They had three children that I believe were all born in Minnesota: Bert (1885), Ben (1888) and Olga (1890). Martha was born around 1852 and I'm not sure about Ole. The 1910 census shows that Martha was widowed and lived with her 3 childrend in North Dakota....any information would be greatly appreciated.