"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X444-SRB : accessed 9 January 2018), Johnny Sinclair in household of Howard W Sinclair, Oberlin, Lorain, Ohio, United States; citing enumeration district (ED) ED 69, sheet 4A, line 31, family 103, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1832; FHL microfilm 2,341,566.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQ6F-9MN : accessed 9 January 2018), Joahn H Sinclair in household of Howard W Sinclair, Ward 3, Erie City, Erie City, Erie, Pennsylvania, United States; citing enumeration district (ED) 68-43, sheet 61A, line 2, family 76, 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 3648.