In 1900, John is enumerated in his parents' household. He says he has been married for 14 years, but his wife is not included in the enumeration. Also, his stated birth date is Oct 1854 rather than Jan 1857, which is the original date given on this profile. 
↑ "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3L3-ZMP : accessed 24 February 2020), John H Marriott in household of Wm E Marriott, Justice Precinct 5 (east part) Wylie town, Collin, Texas, United States; citing enumeration district (ED) 17, sheet 3B, family 53, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,621.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFF1-MS8 : 15 July 2017), John H Marriott, Precinct 5, Collin, Texas, United States; citing enumeration district ED 26, sheet 233B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,255,296.
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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 some percentage (beta) of DNA with John: