I actually believe there is a difference between a US citizen, even a citizen at birth, and a natural born citizen, who needs two parents who are US citizens at the time of birth. There was ample legal commentary for this proposition at the time the Constitution was drafted, but there is also the argument that the 14th Amendment may have changed this.
I am not an expert, but others may have more info. No personal disrespect to you or your family is intended. thanks.
None taken.