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Male Stephen Dewey Lyman Click to view Stephen Dewey Lyman in the family tree

Stephen Dewey was born on June 23rd, 1815 in Sharon, CT.1   Stephen Dewey's father was Orange Lyman and his mother was Maria Dewey.  His paternal grandparents were David Lyman and Mary Brown; his maternal grandfather was Stephen Dewey. He had three brothers and two sisters, and also a sibling of unknown gender, named Henry Martyn, Thomas, Edward, Cornelia, Mary Elizabeth and Eurotas.  He was the oldest of the seven children.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