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

William was born on June 7th, 1784 in Westfield, Hampden, Massachusetts.1   William's father was Russell Dewey and his mother was Sophia Chapin.  His paternal grandparents were Moses Dewey and Sarah Dewey; his maternal grandparents were Elisha Chapin and Miriam Ely. He had a brother and two sisters, named Sewall, Sophia and Laura.  He was the second oldest of the four 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