Walter's draft registration from 1917 states that he was married with three children and still working for the Farr family. He is not listed in their household in 1920.
Sources
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMGV-JK8 : accessed 14 April 2021), Walter Hamilton in household of Jack Hamilton, Lawrie Township, Logan, Oklahoma Territory, United States; citing enumeration district (ED) 141, sheet 6B, family 117, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,339.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLQS-HKC : accessed 15 April 2021), Walter Hamilton in household of John H Farr, Lawrie, Logan, Oklahoma, United States; citing enumeration district (ED) ED 135, sheet 16A, family 184, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1260; FHL microfilm 1,375,273.
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:7HQ4-LNW2 : 22 October 2019), Walter Hamilton, 1917-1918.
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