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

Mary was born after 1751.1   Mary's father was Ebenezer Pierce and her mother was Eunice Loomis.  Her maternal grandparents were Nathaniel Loomis and Sarah Ryley. She had three brothers and five sisters, named Asa, Ebenezer, Enoch, Eunice, Martha, Lydia, Ruth and Jerusha.  She was the second oldest of the nine children.1 

1 phelps.FTW @ Tree #0105
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #3669, 3669.ftw