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

Eleazer was born on December 4th, 1778 in lebanon, CT.1   Eleazer's father was Solomon Dewey and his mother was Anna Downer.  His paternal grandparents were Josiah Dewey and Sarah Huchinson (Hutchinson); his maternal grandparents were Andrew Downer and Sarah. He had four brothers and five sisters, and also a sibling of unknown gender, named Andrew, Silas, Silas, Solomon, Anna, Sarah, Molly, Elizabeth (Betsy), Hannah and Asahel.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