John married Mary Sheldon 3 May 1748 in Suffield, Hartford, Connecticut, Colonial America[1]
Sources
Sheldon Family Genealogy Society.
The Church of Jesus Christ of Latter-day Saints, "Pedigree Resource File," database, FamilySearch (https://familysearch.org/ark:/61903/2:2:9SJS-TB6 : accessed 2016-11-11), entry for Rev. John Graham Jr., submitted by jgraham2744821.
Title
Connecticut, Hale Collection of Cemetery Inscriptions and Newspaper Notices, 1629-1934
Author
Ancestry.com
Publisher
Ancestry.com Operations, Inc.
Publisher Date
2012
Publisher Location
Provo, UT, USA
Ullmann, Helen Schatvet. "Hartford District Probate Records, from 1750, as Abstracted by Lucius Barnes Barbour, from Volume 25 (1793-1800)", Connecticut Nutmegger (Connecticut Society of Genealogists, Glastonbury, Conn., 2012) Vol. 45, Page 244
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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:
http://www.wikitree.com/wiki/GEDCOM-created_biographies#Sections_you_can_delete