I looked up the Parker family in the History of Westford Mass. by Rev. Edwin R. Hodgman A.M. (covers 1659-1883) and found a Benjamin Parker born 1785. His father was a David Parker m. Martha Carver. This Benjamin moved to Acworth,N.H. He was a physician.I found no information on your Benjamin's wife. The Parker family was one of the founding families of Westford and came from Woburn, Ma. Could your families be from Chelmesford?