Researching Ben Bergerson's relatives in Norway

Here is what we know of Ben in the USA: 1 Ben Bergerson Birth: Dec 1878, Norway Death: 4 Jan 1958, Hennepin County, Minnesota Father: Bergerson (-<1900) Mother: Olivia Holm (1863-1934) On Jun 4, 1900 Bennie-21 lived with his mother. His date of birth is given as Dec 1878. On June 14, 1905 Ben-25 lived with his mother and siblings in Eglon, Clay County, Minnesota. They were Olivia-52, Mary-28, Ole-20, John-17, Edwin-16, Henry-11 and Emma-10. Mary and Ben were born in Norway, the younger children were born in Minnesota. On May 4, 1910 Ben-29 and Gertie-23 and daughter Myrtle-4 lived at 301 Seventh Avenue South in Moorhead Ward 2, Clay, Minnesota. Ben’s brother John-24 lived with them. Ben and his brother were house moving contractors. Gertie’s sister and her husband Petra and Andrew Eide appear on the same page of the 1910 Census.