According to Benj Franklin THIS is the definition of Natural Born
“Each of these cases will cite or apply the definition of this term, as given in a book entitled, The Law of Nations, written by Emmerich de Vattel, a Swiss-German philosopher of law. In that book, the following definition of a “natural born citizen” appears, in Book I, Chapter 19, § 212, of the English translation of 1797 (p. 110):
§ 212. Citizens and natives.
The citizens are the members of the civil society: bound to this society by certain duties, and subject to its authority, they equally participate in its advantages. The natives, or natural-born citizens, are those born in the country, of parents who are citizens. As the society cannot exist and perpetuate itself otherwise than by the children of the citizens, those children naturally follow the condition of their fathers, and succeed to all their rights. . . .
aND
Vattel did not invent the notion “natural born citizen”; he was merely applying the Law of Nature to questions of citizenship. In fact the term first appears in a letter of the future Supreme Court Justice, John Jay, to George Washington during the Constitutional Convention, where the Framers were consulting 3 copies Vattel’s book to complete their work (according to the testimony of Benjamin Franklin).”
From the link above
Could this be ANY clearer.