"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KM9S-CXP : 29 February 2020), William Foster in household of Chester Foster, Old Orchard Beach Town, York, Maine, United States; citing enumeration district (ED) 16-59A, sheet 5B, line 56, family 103, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1496.
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DNA Connections
It may be possible to confirm family relationships with William by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with William: