"Nathan Nettleton, father of Mrs. Fenn, was born in Bethany, Conn., September 24, 1791, was a shoe dealer, and married, December 25, 1817, Miss Elizabeth Morris, who was born June 4, 1791, a daughter of Asa and Mary (Bisco) Morris, …"
The younger Nathan could not have been born in September 1791 if his father had died in May of 1790. One or both of these data points in incorrect.