"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKD3-SXS : accessed 20 July 2020), Robert C Mulligan in household of Charles W Mulligan, Farmington, Fulton, Illinois, United States; citing enumeration district (ED) ED 85, sheet 8B, family 173, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 288; FHL microfilm 1,374,301.
*"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJC7-RNV : accessed 20 July 2020), Robert Milligan in household of Charles Milligan, Trivoli, Peoria, Illinois, United States; citing ED 142, sheet 2B, line 93, family 49, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 400; FHL microfilm 1,820,400.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XS1K-7KL : accessed 20 July 2020), Robert Milligan, Peoria, Peoria, Illinois, United States; citing enumeration district (ED) ED 77, sheet 22B, line 97, family 216, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 547; FHL microfilm 2,340,282.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KWTF-CN7 : 21 December 2019), Robert C Milligan, Ward 3, Peoria, Peoria City Township, Peoria, Illinois, United States; citing enumeration district (ED) 104-26, sheet 12B, line 56, family 361, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 917.
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DNA Connections
It may be possible to confirm family relationships with Robert 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: