According to the 1900 Census (reference below), John Westbrook Dain was the son of Frank McLellan Dain Sr. and Grace Avery Dain. His WWI registration records him as born 4 Oct 1899 in Peekskill, New York.
Nathaniel Dain II, Kathryn/Catherine Avery Dain, Emily (Dain) Seymour, Frank McLellan Dain Jr. and Thomas Avery Dain were all siblings of John Westbrook Dain.
John was the husband of Ruth (Ellis) Dain — married 21 Aug 1928. [children unknown]
John Westbrook Dain passed away 1 Jan 1964 in Mahopac, New York.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSPS-RH5 : accessed 3 February 2020), John W Dain in household of Frank M Dain, Peekskill village, Westchester, New York, United States; citing enumeration district (ED) 61, sheet 20B, family 484, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,174.
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It may be possible to confirm family relationships with John 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 DNA with John: