I agree: stuck in a grey area.
Forget location of birth for a moment. Do both parents need to be US Citizens at the time of your birth in order to make the child a natural born citizen? I understand that the parents don't have to be natural born citizens themselves, (i.e., they can be naturalized citizens) but must they be US citizens when the child is born?
Can just one US Citizen parent covey the natural born status? If so, is it only the mother's citizenship that matters (besides the age/time of citizenry of the mother)? Or would the father's citizenship work? What if one or both parents are dual citizens? Is the child automatically a dual (or triple) citizen, too?
What happens in cases of adoption? Say the parents of the child and the place of birth are unknown. Must the adoptive parents be US Citizens at the time of adoption in order to covey the natural born status?
My parents were both born in the US and both were US Citizens when I was born in the US. I am natural born citizen. From this definition, which we all agree is correct, it's a matter of interpretation of case law and constitutional intent.