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

Thomas was born on December 18th, 1788 in Great Barrington, MA.1   Thomas' father was Justin Dewey and his mother was Lucy Mears.  His paternal grandparents were Israel Dewey and Lydia Moseley; his maternal grandparents were John Mears and Lucy Rockwell. He had six brothers and four sisters, named Dennis, Mark, Calvin, Israel, John, Justin, Fanny, Harriet, Clarissa and Louisa.  He was the fourth oldest of the eleven children.1 

1 phelps.FTW
Further source/citation:
World Family Tree Vol. 1, Ed. 1 @ Tree #1377