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Male Sylvanus Dorr Dewey Click to view Sylvanus Dorr Dewey in the family tree

Sylvanus Dorr was born on November 20th, 1819 in White Creek, NY.1   Sylvanus Dorr'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, Sylvanus G., Henry Rice, Mary McIntire, Isabel A., Harriet Rice and Eliza Marvin.  He was the youngest of the eight children. He had a half-brother named Melville.  He died at the age of 51 on December 4th, 1870 in Alabama Center, NY from consumption, age 51.1 

Family Details of Sylvanus Dorr's family with Abigail Platt

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