The Chicago fire destroyed many records which would be helpful.
Sources
↑ "New York State Census, 1855," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K63T-Y1V : 13 March 2018), Sylvester Wheelock, E.D. 2, Lancaster, Erie, New York, United States; citing p. 22, line #23, family #176, county clerk offices, New York; FHL microfilm 825,682.
↑ "United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCYW-FB6 : 12 April 2016), Sylvester Wheelock, Lancaster, Erie, New York, United States; citing family 973, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
↑ "United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M67X-769 : 12 April 2016), S W Wheelock, Illinois, United States; citing p. 193, family 1544, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,705.
↑ "Illinois, Cook County Deaths, 1878-1994," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N7KY-12X : 17 May 2016), Sylvester Wheelock, 28 Nov 1903; citing , Cook, Illinois, United States, source reference p19804 cn21068, record number 10, Cook County Courthouse, Chicago; FHL microfilm 1,239,699.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS3K-ZRD : accessed 28 September 2017), Sylvester Wheelac?, Precinct 20 Chicago city Ward 14, Cook, Illinois, United States; citing enumeration district (ED) 437, sheet 10A, family 174, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,262.
Ed Burke, firsthand knowledge. Click the Changes tab for the details of edits by Ed and others.
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DNA Connections
It may be possible to confirm family relationships with Sylvester by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: