Never married according to the Brann source, but found a marriage record.
Sources
The Michael O'Hair Family - By Mrs. C. Gerald Brann, May 1957
Census Records:
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXJ6-F3M : 15 September 2017), Adin Hanks in household of Mike Hanks, Symmes, Edgar, Illinois, United States; citing enumeration district ED 105, sheet 244C, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,205.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS4Z-G89 : accessed 1 September 2020), Charles A Hanks in household of Joseph Hanks, Yates Township, McLean, Illinois, United States; citing enumeration district (ED) 123, sheet 3A, family 46, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,323.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MK81-FRV : accessed 1 September 2020), Aden Hanks in household of Micheal Hanks, Symmes, Edgar, Illinois, United States; citing enumeration district (ED) ED 57, sheet 10B, family 152, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 286; FHL microfilm 1,374,299.
"Illinois, County Marriages, 1810-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QK9L-CTVN : 17 October 2017), Charles A Hanks and Lillie M Thompson, 18 Jan 1887; citing Livingston, Illinois, United States, county offices, Illinois; FHL microfilm 1,401,628.
"Illinois, County Marriages, 1810-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QK9L-CTVN : 17 October 2017), Charles A Hanks and Lillie M Thompson, 18 Jan 1887; citing Livingston, Illinois, United States, county offices, Illinois; FHL microfilm 1,401,628.
Find a Grave, database and images (https://www.findagrave.com : accessed 01 September 2020), memorial page for Charles Adin Hanks (21 Oct 1865–27 Jan 1942), Find a Grave Memorial no. 140382739, citing Edgar Cemetery, Paris, Edgar County, Illinois, USA ; Maintained by C Jirsa (contributor 47323960) .
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DNA Connections
It may be possible to confirm family relationships with Charles by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Charles: