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

Zenas was born about 1750 in Sheffield, MA.1   Zenas' father was Samuel Dewey and his mother was Elizabeth Younglove.  His paternal grandparents were Samuel Dewey and Sarah Weller; his maternal grandparents were Samuel Younglove and Abilene Hunter. He had three brothers and three sisters, named Ezekiel, John, Samuel, Elizabeth, Hannah and Thankful.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