I found this article a while back and have used some of the information contained within on several occasions. Take a look at it, research the information it has and see if it can help you out.
http://www.thepostemail.com/2009/10/18/4-supreme-court-cases-define-natural-born-citizen/
4 Supreme Court Cases define "natural born citizen"
IRREFUTABLE AUTHORITY HAS SPOKEN
by John Charlton
(Oct. 18, 2009) — The Post & Email has in several articles mentioned that the Supreme Court of the United States has given the definition of what a “natural born citizen” is. Since being a natural born citizen is an objective qualification and requirement of office for the U.S. President, it is important for all U.S. Citizens to undertsand what this term means.
Let’s cut through all the opinion and speculation, all the “he says”, “she says”, fluff, and go right to the irrefutable, constitutional authority on all terms and phrases mentioned in the U.S. Constitution: the Supreme Court of the United States.
First, let me note that there are 4 such cases which speak of the notion of “natural born citizenship”.
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):
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The evidence speaks for itself. (But not one in Congress, neither House nor Senate, is listening.)