[bgill]

For example: “two citizen parents” Both parents may be citizens, but one, or either both them were not born in the USA.

It's very simple. To be a NBC, both parents must be citizens of the US at the time of the person's birth. It doesn't matter if the parents were born here or went through legal naturalization just as long as they are US citizens when the person is born. The only exception was made clear in the Constitution for those citizens back during the signing of the Constitution meaning the founding fathers were eligible.

[AlexW]

“To be a NBC, both parents must be citizens of the US at the time of the person’s birth.”
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I do not think there has ever been any question about that.
The question is about the BIRTHPLACE of each parent.

The Obots claim that the birthplace of the parent is
irrelevant, as long as the parents are US citizens.

This is the ONLY point where I would like clarification.