Mary,If you go to familysearch.org and look at the 1900 census for Alfred and Jonathan Coleman it says that their father was born in Ohio and their mother was born in Pennsylvania. I would think that Madaline is their mother. I looked at the 1910 census for a Jonathan in Colorado that was born in Iowa around 1881 and found Jonathan Grossnickle in Greeley, Weld County, with his wife Nellie and daughter Clara.
1880 census for Perry, Marion, Iowa (the last name is indexed as Grossmickle) John Grossnickle-age 37-born OH Magdelana Grossnickle-age 38-born PA James-son-age 13-born IA John-son-age 11-born IA Clara-age 8-born IA Jefferson-son-age 6-born IA Alfred-son-age 3-born IA
Iowa Marriages Jonathan Grossnickle Magdalana Enfield August 8, 1866 Polk County, Iowa
At findagrave.com John Grossnickle Born-1881 Died-1933 Buried in Linn Grove Cemetery-Weld County
I think this is the information you are looking for.Good luck in your search.Kathryn