Although no birth or baptismal records have been found for Mary Willey (1648), she is beyond doubt the daughter of Isaac Willey as proved by the following will: her sister, Sarah Willey Terrell, left a will dated March 1711/1712 and mentioned the following children of her sister, Mary Willey Tubbs: Samuel, William, Isaac, Joseph, John, Mary Leach, Joanne Buddington, Sarah Beebe, and Bethia Chapman.