This tree starts in 1630 with the arrival of Thomas Dennis to Cape Cod via London with the Winthrop Fleet, a convoy of 11 ships that were sent to support the Massachusetts Bay Colony (or Plantation, as it was called).They were not Puritans or Pilgrims, but skilled craftsmen (carpenters, in our case, and later, builders and supervisors of bridges in NJ).There were several adult Dennis names onboard the Jewell, and they could have been related, according to grandma's cousin who did the research.
His son John was born on the ship Jewel and married Sarah Bloomfield.They settled in Woodbridge, NJ.A branch of the Woodbridge Dennis tree moved to Cape May County, NJ, where there are still Dennis and Dennisville place names.John Jr. married Rachel Hull (in Cape May?) and they moved to Dutchess County, NY (near the Catskills) in the 1760's. before the revolution (1760's).
The next generation included Joseph, Samuel, Cornelius, Jonathan (my ancestor, and a major in the continental army), Isaac, Cornelia, and Rachel.Many of these family names are repeated over and over in different branches of the family, so the NJ Cornelia may be a later cousin of 'my' Cornelia born in Dutchess County, NY.
Jonathan's son Robert moved to Burgessville, Ontario, Canada in 1820 with his ten children and wife, Eve Tanner.As a third son, I guess he did not inherit the farm?Burgessville was notable for being the northern terminus of the underground railway for runaway slaves, run by Quakers, some of whom may have been related to Dennis in-laws. Jonathan's wife Mary Emigh and son Robert's wife Eve Tanner were descended from Palatine Germans who came over in the 1740's, some of whom joined Quaker congregations in Dutchessville.
I could not find a Middleboro, New York to see where it was located.Your Cornelia would have been 37 years old at the time of her marriage, so possibly a second marriage (widowed?).The other Cornelia you found in NJ in 1895 would have made your Cornelia over 150 years old, so she must be another branch of the tree.