1910 census gives his age as 25, which would make his birth year about 1885, probably incorrect.
DNA
Maternal relationship is confirmed by a ancestry.com test match between Mack Tyner III GEDmatch A541884 and his third cousin John Fowler . Their Most Recent Common Ancestor (MRCA) is their second great grandfather James Malcolm Baggett. Estimated number of generations to MRCA = 3.9, based on sharing 19 cM of DNA across 2 segments.
Sources
Daniel Campbell and Effie McLean by Mayme Tyner, 1982, page 100
"United States Census, 1900," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M36F-BXC : accessed 29 July 2023), Mary Fowler in household of John Fowler, Precincts 5-7, McDades Pond, Yellow River, Shoal River & Precinct 15, Crestview & Precinct 18, Walton, Florida, United States; citing enumeration district (ED) 121, sheet , family , NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm .
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DNA Connections
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 some percentage of DNA with John: