"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDJV-X8X : 12 April 2016), James W Fircus in household of Jan A Fircus, Iowa, United States; citing p. 22, family 159, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,877.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXVT-693 : 20 August 2017), James Fescus in household of John Fescus, Duncan, Mercer, Illinois, United States; citing enumeration district ED 173, sheet 273A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0236; FHL microfilm 1,254,236.
It may be possible to confirm family relationships with James 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 DNA with James: