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Female Mercy Dewey Click to view Mercy Dewey in the family tree

Mercy was born on May 13th, 1764 in Westfield, Hampden, Massachusetts.1   Mercy's father was Ashbel Dewey and her mother was Mehitable Cadwell.  Her paternal grandparents were Adijah Dewey and Mercy (Mary) Ashley; her maternal grandparents were Abel Cadwell and Anna Dwight. She had two half-brothers and a half-sister, named Adijah, Ashbel and Mary.  She died at the age of 2 in January 1767 in Westfield, Hampden, Massachusetts.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