Will of Philip Shattuck, dated 29 Jan 1722 mentions granddaughter Rebecca Underwood, and will of his widow Rebecca dated 13 Dec 1727 mentions granddaughter Rebecca Gale.
↑Source:Watertown records, p. 105: "Rebeckah Gale Daughter to Samuel and Rebeckah Gale Born May 24 : 1725" so marriage before 1725.