I too descend from Francis and Isabel O'Connor. There son Joseph had a son Josiah Hazelwood Abel who married Sarah Evelyn McNanny and they had Rachel Jane Abel who married Thomas Edward Brown. Thomas Brown was my great-great grandfather. I have heard the same information that Francis Abel served under Cornwallis in the Revolution and that he was taken prisoner at Yorktown, VA. I have heard that they were married in Pennsylvania.Hope this helps. I will try to find more of my information.