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

Betsey was born in 1778 in Springfield, MA.1   Betsey's father was Simeon Dewey and her mother was Elizabeth Turner.  Her paternal grandparents were Simeon Dewey and Anna Phelps; her maternal grandparents were Isaac Bridgman and Elizabeth Hatch. She had five brothers and three sisters, named Jesse, Luke, Simeon, William Phelps, Joseph Langdon, Cynthia, Sophronia and Paulina.  She was the third oldest of the nine children. She had a half-sibling of unknown gender named Seneca.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