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

Joel was born on October 23rd, 1804 in Feeding Hills, Hampden Co. MA.1   Joel'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 Sylvanus G., Henry Rice, Sylvanus Dorr, Mary McIntire, Isabel A., Harriet Rice and Eliza Marvin.  He was the oldest of the eight children. He had a half-brother named Melville.1 

1 phelps.FTW
Further sources/citations:
World Family Tree Vol. 4, Ed. 1 @ Tree #2332, 2332.ftw, phelps.FTW @ Tree #1353, World Family Tree Vol. 1, Ed. 1 @ Tree #3310