Checked Ancestry, FamilySearch and Google search for a marriage between John Calkin(s) and Ida ____ without success.
Searched the Census for Ida Calkins in 1900-1920.
Found an Ida B Calkins in Washington with a son surname Ely.
There is an Ida in the 1900 Census in Oklahoma, but she is married to Chas Ely. Says that she has been married 15 years, has 6 children born/6 living. Most of them are in that household and named Ely.
Sources
↑ "United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6WR-XGS : 12 April 2016), John Calkin in household of Stephen Calkin, Illinois, United States; citing p. 48, family 373, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,788.
↑ Oklahoma, County Marriage Records, 1890-1995;Original data: Marriage Records. Oklahoma Marriages. Various Oklahoma County marriage collections[1]
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6WR-XGS : 12 April 2016), John Calkin in household of Stephen Calkin, Illinois, United States; citing p. 48, family 373, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,788.
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DNA Connections
It may be possible to confirm family relationships with John by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: