Isaac's mother would be Josiah's 2nd spouse Joanna Wilbore (1706-1760). The birth date of 1737 is from a group of old Mayflower Society applications quoting Mayflower Descendant, but not in that database.
Is it possible the marriage intent for Isaac and Jerusha was filed in Bridgewater, then they married in NH, returned 2 days later and married again in Bridgewater, then returned to live in NH?
They appear to be 2nd cousins, with one parent couple being 1st cousins, so only 4 distinct great-grandparents.
They appear to have 10 children, at least 5 having grandchildren.
This profile is a collaborative work-in-progress. Can you contribute information or sources?
Sources
↑ First-hand information as remembered by Robert Curry, Sunday, November 23, 2014. Replace this citation if there is another source.
See also:
Massachusetts, U.S., Town and Vital Records, 1620-1988 Image
Event Place: Westmoreland, Cheshire, New Hampshire
Spouse's Name: Jerusha Leach
Record Number: 105
Lin Grant-family records
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DNA Connections
It may be possible to confirm family relationships with Isaac 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 Isaac: