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

Gideon was born on July 7th, 1758 in Westfield, Hampden, Massachusetts.1   Gideon's father was Moses Dewey and his mother was Sarah Dewey.  His paternal grandparents were Adijah Dewey and Sarah Root; his maternal grandparents were Israel Dewey and Sarah Root. He had two brothers and three sisters, named Moses, Russell, Sarah, Esther and Keziah.  He was the youngest of the six children.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