The Hanson family from McFarland, WI

Dear Listers! I would like to share with you another challenge: Hans Sjurson Burtness aka Hans Severson, born in Hafslo May 15, 1818 married in Hafslo June 23, 1852 to Kirsti Christensdotter Aasen aka Christine, born in Hafslo June 10, 1824. They emigrated in 1855 and settled on a farm in Dunn township near McFarland, Dane Co., WI where Hans died Nov. 12, 1878. Christine as a widow changed her last to HANSON and died Aug. 11, 1912. Then where the challenge starts, their children. There were totally 10 of them, who all seem to have taken the last name HANSON after the father died in 1878, but not to make the family situation more complicated than necessary, I have in the following left out the ones who are known to have died young and single, most of them from consumption in the late 10's or early 20's. According to the 1900 and 1910 census Christine only had THREE of her totally ten children still alive. One of them was: * Johan aka John Hanson, born in Dane Co., WI Sep. 20, 1858, took over the home farm near McFarland, WI, but died in Madison, WI Apr. 3, 1938. He never married, and his obituary tells us he was survived by a cousin, Mrs. Andrew Werken in Madison, WI and a niece (not named) in Chicago, IL For the other two children, and the father or mother of the niece in Chicago, IL we have these alternatives: * Elizabeth (Severson) Hanson, born in Hafslo Jan. 8, 1854, was confirmed in McFarland, WI in 1869 and may be identical to a servant named Betsey Severson in Stoughton, WI in 1870 (before the family name changed to Hanson)!? One Elizabeth Hanson, aged 36, was married in Chicago, IL Apr. 7, 1888 to Benedig Carstenson, aged 48, but maybe that's the one who died in Chicago, IL May 6, 1889, born in Norway and aged 37? * Christopher (Severson) Hanson, born in Dane Co., WI Jan. 21, 1857, was confirmed in McFarland in 1872, later destiny so far unknown * Betsy Christine aka Bettie Hanson, born in Dane Co., WI Mar. 15, 1861, moved to Chicago, IL and married there (Bethania Lutheran) on May 5, 1883 to William B. BROWN, born in Sweden about 1855. William was a mail carrier and later a saloon keeper residing 1885/1888 on 117 Sedgwick in Chicago, IL. What later became of this couple, I have not been able to figure out... There was a widowed laborer W. B. Brown, born in Sweden 1857, who died in Chicago, IL Feb. 12, 1902 and was buried at «Policlinic», but there are other William Browns in other cities who would «match» as well... All emigration research has it's challenges, and I appreciate very very much any suggestions in regard to these three Hanson-siblings! Very sincerely yours,