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Male Walter W. Dewey Click to view Walter W. Dewey in the family tree

Walter W. was born on June 24th, 1875 in Montpelier, VT.1   Walter W.'s father was Orville Dewey and his mother was Fannie Williams.  His paternal grandparents were Osman Dewey and Mrs. Rebecca (Davis) Farwell; his maternal grandparents were Freeman Williams and Maria Egerton. He had two brothers and two sisters, named Denison I., Marion B., Alice and Anne Best.  He was the third oldest of the five 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