Daniel was the son of Joseph Pinkham by his second wife, Elizabeth Hayes.
See: "Richard Pinkham of Old Dover, New Hampshire and His Descendants East and West" by Rev. Charles Nelson Sinnett (Concord, NH 1908), pp. 211, 213 and 217-218, et seq.
See also "John Hayes of Dover, New Hampshire; A Book of His Family" by Katharine F. Richmond, 2 vols. (Tyngsboro, MA, 1936) and “The Native Ministry of New Hampshire” by Rev. Nathan Franklin Carter (Rumford Press, Concord, NH, 1906).