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Male Arthur Waldo Dewey Click to view Arthur Waldo Dewey in the family tree

Arthur Waldo was born on September 12th, 1855 in Boston Highlands, MA.1   Arthur Waldo's father was Solon William Dewey and his mother was Ann Elizabeth Sprague.  His paternal grandparents were William Phelps Dewey and Abigail Campbell. He had two brothers named Solon William and Orville Sprague.  He was the youngest of the three 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