'MARGARET, b. say 1654; m. 27 November 1670 Richard Hartshorne [NYGBR 14:95]' The author points out that the marriage record doesn't identify Margaret's parents, but "there are a number of reasons to believe that this identification is correct", followed by 3 reasons.
↑ See the Family page of her parents. Only valid if Caleb was before 1648, since Caleb was named as eldest child in their father's will.