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Male Francis Osman Dewey Click to view Francis Osman Dewey in the family tree

Francis Osman was born on June 20th, 1823 in Berlin, VT.1   Francis Osman'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 Denison and Simeon.  He was the 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