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

Oliver was born on August 12th, 1763 in Westfield, Hampden, Massachusetts.1   Oliver's father was Moses Dewey and his mother was Hannah Noble.  His paternal grandparents were Moses Dewey and Sarah Dewey; his maternal grandparents were Israel Noble and Elizabeth Miller. He had two brothers and four sisters, named Roswell, Adijah, Dolly, Hannah, Sarah and Charlotte.  He was the oldest of the seven 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