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

Mercy was born on June 27th, 1668 in Hatfield, MA.1   Mercy's father was William Gull and her mother was Elizabeth Smith.  Her maternal grandparents were Samuel Smith and Elizabeth Chileab. She had a sister named Ester. She had three half-brothers and a half-sister, named Samuel, Daniel, Nathaniel and Elizabeth.1 

Family Details of Mercy's family with Jeremiah Alvord

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