Can you tell me where the siblings were born? As you must know by now, there are so many John Johnson's out there. In the 1870 census alone there are 697 in Illinois. My Johnson family had three, Jon, Johanness and John. It would help to know where they were born. I thought I'd start with the 1870 and move up to 1880 if they didn't appear. Have you searched the 1880 online at familysearch.com? Another great onliine database source is the Illinois State Archives. Joan in Illinois