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

Benjamin was born after 1772.1   Benjamin's father was Benjamin Dewey and his mother was Rhoda Loomis.  His paternal grandparents were Joseph Dewey and Beulah Sackett; his maternal grandparents were Noah Loomis and Rhoda L Clark. He had a brother and five sisters, named Charles, Rhoda, Lydia, Betsey, Clarissa and Sophia.  He was the second oldest of the seven children.1 

1 phelps.FTW @ Tree #0105
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #3669, 3669.ftw