Potential typo/error in birth date on Find a Grave - Robert does not appear in 1881 Census with the rest of his family, and other records indicate his birth year is 1886-1888, so likely the date of 1877 on his Find a Grave is incorrect.
Sources
"Canada Census, 1891," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:MW2D-S2R : 13 November 2014), Robert Henry, Sombra, Bothwell, Ontario, Canada; Public Archives, Ottawa, Ontario; Library and Archives Canada film number 30953_148127.
"Canada Census, 1901," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KH2C-3D5 : 27 April 2017), Robt Henry in household of Elisabeth Mckillican, Bothwell, Ontario, Canada; citing p. 2, Library and Archives of Canada, Ottawa.
"Recensement du Canada de 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV9T-2FMB : 2 March 2015), Robert R Henry in entry for Aaron Henry, 1911; citing Census, Lambton West Sub-Districts 38-60, Ontario, Canada, Library and Archives of Canada, Ottawa, Ontario; FHL microfilm 2,418,506.
"Michigan Marriages, 1868-1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N32G-2GG : 4 December 2014), Robert Henry and Vergie Spink, 27 Sep 1912; citing Monroe, Monroe, Michigan, p 87 rn 473, Department of Vital Records, Lansing; FHL microfilm 2,342,698.
"Ohio Deaths, 1908-1953," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X859-1JX : 15 August 2019), Robert Henry, 23 Feb 1922; citing Sandusky, Erie, Ohio, reference fn 8271; FHL microfilm 1,991,911.
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DNA Connections
It may be possible to confirm family relationships with Robert 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 Robert: