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

Zebediah was born in 1757 in Massachusetts.1   Zebediah's father was Solomon Jackson and his mother was Zebediah Dewey.  His maternal grandparents were Thomas Dewey and Abigail Williams. He had three brothers and five sisters, named Jonathan, David, Thomas, Keziah, Anna, Artemesia, Beulah and Charlotte.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