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Female Ruth Blackwell Click to view Ruth Blackwell in the family tree

Ruth was born on April 5th, 1888.1   Ruth's father was Edward Dickinson Blackwell and her mother was Jennie Dewey.  Her paternal grandparents were Edward R. Blackwell and Persis Dickinson; her maternal grandparents were Charles Dewey and Betsey Lund Tarbox. She had two sisters named Kate Dewey and Ella Dickinson.  She 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