Circa 1690 -- John was born at New Town, Queens County, New York
Circa 1721 -- John married Mary Elizabeth Williams
John Denman and Mary Williams "married in 1721 or 1722." John and Mary "had two daughters, Mary and Jennie, and four sons, John, Joseph, Daniel, and Christopher." 
March 15, 1776 -- John is thought to have died at Westfield, Essex County, New Jersey
NOTE: "Town of Newtown, chartered as Middleburgh in 1652, renamed Hastings in 1663, and then New Towne in 1665. . In 1896, the residents of Newtown chose the current name "Elmhurst" "to disassociate themselves from Maspeth, Queens, and the smelly, polluted Newtown Creek." 
The Denman family (as well as the Hendricks and Craig families) belonged to St. John's Episcopal Church of Elizabeth, New Jersey, until the latter part of 1776, when British soldiers occupied the church and used it as a barracks. These families then joined the Presbyterian Church of Westfield, Union county, New Jersey, which was closer to their homes. 
Denman Family History: From the Earliest Authentic Records Down to the Present Time. Compiled by Mrs. Harriet N. Harris. 1913. The Glendale News, Glendale, California. Reprinted by Nabu.
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It may be possible to confirm family relationships with John 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 DNA with John: