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Male William Henry Dewey Click to view William Henry Dewey in the family tree

William Henry was born on May 22nd, 1844.1   William Henry's father was Alonzo Baldwin Dewey and his mother was Emeline Washburn.  His paternal grandparents were Israel Dewey and Betsey Baldwin. He had four brothers and a sister, named Andrew Spencer, Edwin Alonzo, George Israel, John Calvin and Adaline Charlotte.  He was the youngest of the six 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