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

Denison was born on June 7th, 1825 in Berlin, VT.1   Denison's father was Osman Dewey and his mother was Betsey Perley.  His paternal grandparents were Simeon Dewey and Prudence Yemans; his maternal grandfather was James Perley. He had two brothers named Francis Osman and Simeon.  He was the second oldest of the three children. He had a half-brother and two half-sisters, named Orville, Betsey Ann and Marion Rebecca.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