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Male Jonathan Dewey Click to view Jonathan Dewey in the family tree

Jonathan was born about 1770 in Massachusetts.1   Jonathan's father was Solomon Jackson and his mother was Zebediah Dewey.  His maternal grandparents were Thomas Dewey and Abigail Williams. He had three brothers and five sisters, named Zebediah, David, Thomas, Keziah, Anna, Artemesia, Beulah and Charlotte.1 

1 phelps.FTW @ Tree #1353
Further sources/citations:
World Family Tree Vol. 1, Ed. 1 @ Tree #3310, phelps.FTW, World Family Tree Vol. 4, Ed. 1 @ Tree #2332, 2332.ftw