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

Isaiah was born on October 18th, 1746 in Lebanon, CT.1   Isaiah's father was Joseph Dewey and his mother was Abigail Hills.  His paternal grandparents were Josiah Dewey and Mehitable Miller. He had three brothers and four sisters, named Josiah, Joseph, Elizur, Mehitable, Mary, Abigail and Deborah.  He was the youngest of the eight 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