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

Sewall was born on March 3rd, 1782 in Westfield, Hampden, Massachusetts.1   Sewall'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 William, Sophia and Laura.  He was the 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