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Female Mercy Otis Click to view Mercy Otis in the family tree

Mercy was born on September 14th, 1728 in Barnstable, Massachusetts.1   Mercy's father was James Otis and her mother was Mary Allyn.  Her maternal grandparents were Joseph Allyn and Mary Doty. She had five brothers and five sisters, named Nathaniel, Samuel, Nathaniel, James, Joseph, Hannah, Martha, Abigail, Elizabeth and Sarah.1 

1 0938.ftw
Further source/citation:
World Family Tree Vol. 22, Ed. 1 @ Tree #0938