"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8P1-KJC : 12 April 2016), Philip Harmon in household of Abraham Harmon, Randolph county, Randolph, Illinois, United States; citing family 1616, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Find A Grave: Memorial #116653242: accessed 01 February 2020), memorial page for Phillip Harmon (2 Aug 1832–18 Jun 1877), citing New Palestine Church Cemetery, New Palestine, Randolph County, Illinois, USA ; Maintained by Angie Knott (contributor 46919045) .
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Harmon-6403 and Harmon-2956 appear to represent the same person because: Same parents and same birth date and birth location. But the key to knowing these are the same person is all of the duplicate siblings as well as parents. Merge the parents first, then the kids.