Will of Josiah's grandfather, Samuel Hatch, dated 13 Jun 1728, mentions "my Six Grand-Children ye Children of my Son Josiah Hatch deces'd viz Edmond, Jabez, Josiah Desier, Surviah and Mary".
↑ There is no birth record for Mary. The will of her grandfather lists Mary last among the daughters. There is no obvious spot before Ebenezer's birth in March 1711, i.e., so no earlier than 1712, and sometime before the end of 1715, since her father died in early 1715. Whether she is older or younger than Josiah is unknown, and 1714 is an arbitrary guess fitting these assumptions. No other events in her life have yet been found to provide any further basis for estimating a birth.