"Ohio, County Marriages, 1789-2013," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XDP9-5JZ : accessed 28 February 2016), William Patrick Cahill and Bessie Legora Flannigan, 30 Jun 1896; citing Huron, Ohio, United States, reference p 42; county courthouses, Ohio; FHL microfilm 410,263.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMDS-SRB : accessed 28 February 2016), William Cahill, New Haven Township Chicago Junction village (part), Huron, Ohio, United States; citing sheet 14B, family 342, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,288.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MG8X-2M1 : accessed 28 February 2016), William P Cahill, New Castle Ward 3, Lawrence, Pennsylvania, United States; citing enumeration district (ED) ED 124, sheet 13A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,374.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M613-1H1 : accessed 28 February 2016), William P Cahill, New Castle Ward 1, Lawrence, Pennsylvania, United States; citing sheet 12B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,585.
"Ohio Deaths, 1908-1953," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X83G-M8L : accessed 28 February 2016), William P Cahill, 22 Aug 1943; citing Cincinnati, Hamilton, Ohio, reference fn 50601; FHL microfilm 2,024,139.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KWPD-6GK : accessed 28 February 2016), W P Cahill, Ward 4, Cincinnati City, Cincinnati City, Hamilton, Ohio, United States; citing enumeration district (ED) 91-52, sheet 17B, family 477, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 3188.
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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 Y-chromosome or his mother's 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: