"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXZ3-9Q1 : accessed 2 August 2018), James C Buchannan in household of William ? Buchannan, Lost Creek, Cleburne, Alabama, United States; citing ED 64, sheet 10B, line 91, family 190, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 7; FHL microfilm 1,820,007.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V1LK-L1Q : accessed 2 August 2018), J Cliff Buchanan, Election Precinct 9, Cleburne, Alabama, United States; citing enumeration district (ED) 15-11, sheet 13A, line 40, family 249, 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 15.
Find A Grave, database and images (https://www.findagrave.com : accessed 02 August 2018), memorial page for James Cliff Buchanan (16 Nov 1910–25 Jan 1953), Find A Grave Memorial no. 81601610, citing Ranburne First Baptist Church Cemetery, Ranburne, Cleburne County, Alabama, USA ; Maintained by Sarah Johnson (contributor 47287914) .
It may be possible to confirm family relationships with James by comparing test results with other carriers of his Y-chromosome or his mother's 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: