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

Andrew was born on December 29th, 1751 in lebanon, CT.1   Andrew'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 Silas, Silas, Eleazer, 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