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Female Mary Leonard Click to view Mary Leonard in the family tree

Mary was born on July 13th, 1754 in Springfield, MA.1   Mary's father was Moses Leonard and her mother was Constant Dewey.  Her maternal grandparents were Israel Dewey and Sarah Root. She had two brothers and two sisters, and also a sibling of unknown gender, named Moses, Moses, Constant, Huldah and Phineas.  She was the third youngest 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