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

John was born on June 27th, 1743 in Lebanon, CT.1   John's father was David Dewey and his mother was Hannah Hall.  His paternal grandparents were John Dewey and Mary Thomas; his maternal grandfather was Nathaniel Hall. He had a brother and two sisters, and also a sibling of unknown gender, named David, Hannah, Rhoda and Cyrennius.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