"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M85Y-FFT : 4 April 2020), Wm A Todd in household of Samuel B Todd, Northfork, Jasper, Illinois, United States; citing family 458, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
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DNA Connections
It may be possible to confirm family relationships with William A. 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: