Mercy was born on July 25th, 1654 in Plymouth, Plymouth, RI and her baptism took place on July 25th, 1654. Mercy's father was John COOKE and her mother was Sarah Warren. She had a brother and five sisters, named John, Elizabeth, Esther, Sarah, Susanna and Mary. She was the third youngest of the seven children. She died at the age of 79 on November 21st, 1733 in Dartmouth, Mass.