Johannes Knudson and Margrete Larsdatter born Kvin

Johannes Knudson Bondhus b. April 12. 1823 and Margrete Larsdatter b. May 20. or 26.1835, married November 18. 1857, had their first child Knud b. Mars 5. 1857, all born Kvinnherad, Norway, no records about them after 1860. Next time they appeared in church records for West Lisbon Lutern, Kendall Co. Ill. Johannes Knudson and Margrete Larson baptizted 4 children. Ragnille July 14. 1864, Knud july 12. 1865, Ragnille Tomine May 4. 1867 and Johannes June 5. 1870. So far no sign about them in any census in Ill. I have the info that a widow Margrette Knutson moved from Ill. and homesteaded at Hopper Twp. Aurora Co. SD, about 1883. It seems that a John Knutson b. ill June 1871 was landowner at the same farm in 1909. I know it wery well could be a wild one. Do anyone have any info. Regads Magnar.