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

William was born on March 9th, 1769 in Lebanon, CT.1   William's father was Elijah Dewey and his mother was Abigail Martin.  His paternal grandparents were William Dewey and Mercy Bailey. He had three brothers and five sisters, named Elijah, Martin, Saxton, Zerviah, Theoda, Jerusha, Hannah and Jemima.  He was the youngest of the nine 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