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Male Sylvanus G. Dewey Click to view Sylvanus G. Dewey in the family tree

Sylvanus G. was born on November 6th, 1807 in Feeding Hills, Hampden Co. MA.1   Sylvanus G.'s father was Joel Dewey and his mother was Isabella Griswold.  His paternal grandparents were Josiah Dewey and Huldah Frost; his maternal grandparents were Sylvanus Griswold and Elizabeth Marvin. He had three brothers and three sisters, and also a sibling of unknown gender, named Joel, Henry Rice, Sylvanus Dorr, Mary McIntire, Isabel A., Harriet Rice and Eliza Marvin.  He was the third oldest of the eight children. He had a half-brother named Melville.  He died at 10 months old on September 15th, 1808 in Feeding Hills, Hampden Co. MA.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