There apparently is another son "Hendrick Williamson who was born in 1827 and died in 1845. I cannot find any sources for him at this time. I will add him later when I find some.
Sources
"Ohio, County Marriages, 1789-2013," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XZD7-YJD : 8 December 2014), John Williamson and Huldah Doty, 12 Feb 1824; citing Butler, Ohio, United States, reference v 1 p 191; county courthouses, Ohio; FHL microfilm 355,779.
"United States Census, 1840," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHRX-P4C : 24 August 2015), John Williamson, Lemon Township, Butler, Ohio, United States; citing p. 149, NARA microfilm publication M704, (Washington D.C.: National Archives and Records Administration, n.d.), roll 380; FHL microfilm 20,160.
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