First wife, Marietta Beswick, married 16 Apr 1866 Galesburg, Illinois.
company A 11 Illinois, Infantry
Sources
"Iowa Marriages, 1809-1992," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XVSL-4MV : 3 December 2014), William Graham in entry for John M. Graham and Belle Johnston, 24 Dec 1895; citing Wall Lake, Sac, Iowa, reference ; FHL microfilm 1,433,254.
"Iowa, Delayed Birth Records, 1850-1939," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q246-MQHS : accessed 12 December 2016), John Murray Graham in entry for Loren Oneil Graham, 02 Jul 1897; citing Wall Lake Township, Sac, Iowa, United States, State Historical Society of Iowa, Des Moines; FHL microfilm .
"Iowa State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VTQ3-JJP : 17 November 2014), John M Graham in household of Loren H O'Niel, Monona, Iowa, United States; citing p. 489, 1895, State Historical Society, Des Moines; FHL microfilm 1,022,085.