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Male Andrew Spencer Dewey Click to view Andrew Spencer Dewey in the family tree

Andrew Spencer was born on October 21st, 1833.1   Andrew Spencer'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 Edwin Alonzo, George Israel, John Calvin, William Henry and Adaline Charlotte.  He was the oldest 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