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

Jonathan was born on October 21st, 1732 in Sheffield, MA.1   Jonathan's father was Jonathan Dewey and his mother was Elizabeth Sikes.  His paternal grandparents were Samuel Dewey and Sarah Weller; his maternal grandparents were Victory Sikes and Mary King. He had two brothers and four sisters, and also a sibling of unknown gender, named Samuel, Oliver, Elizabeth, Sarah, Huldah, Rhoda and Pelatiah.1 

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