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Female Thena B. Dewey Click to view Thena B. Dewey in the family tree

Thena B. was born on August 22nd, 1858 in Montpelier, VT.1   Thena B.'s father was John Page Dewey and her mother was Julia Parthenia Tryon.  Her paternal grandparents were Zenas Coleman Dewey and Eliza Page; her maternal grandparents were Marvin Tryon and Parthenia Dewey. She had two brothers and three sisters, named John Page, Marvin Zenas, Elizabeth Abigail, Henrietta Cordelia and Cornelia Way.  She was the second 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