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Male Marion B. Dewey Click to view Marion B. Dewey in the family tree

Marion B. was born on July 15th, 1877 in Montpelier, VT.1   Marion B.'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., Walter W., Alice and Anne Best.  He was the second youngest 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