The Church of Jesus Christ of Latter-day Saints, "International Genealogical Index (IGI)," database, FamilySearch (https://familysearch.org/ark:/61903/2:1:M45G-1T4 : accessed 2016-03-03), entry for John Sr. Glover.
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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: