For full disclosure: I taught US government for over 30 years.
I am not qualified to label anyone a “birther”. I do know that the original (NOT current, that’s clearly in dispute with multiple interpretations) requirement for natural born citizenship included birth within the US and two natural born citizen parents.
The Constitutional requirement to be a natural born citizen applies solely to the office of President of the US.
Grandparents’ or earlier ancestors’ citizenship was/is irrelevant.
I don’t think you understood my point.
For a person (for clarity, let’s call him John) to be Constitutionally eligible for the presidency as a natural born citizen using your “original” definition, both of his parents would also have to be natural born citizens.
What circumstances of birth would have to have been in place for John’s parents to be natural born citizens?
Again, by your definition, each of their parents (i.e. John’s grandparents) would have to be natural born as well.
If any of those four weren’t natural born (a naturalized citizen or non-citizen), then the Constitutional requirement for one of their offspring (either John’s mother or father) to be natural born wouldn’t be met. And, in turn, the Constitutional requirement for John to be natural born wouldn’t be met either.
The “original” definition that you cite is unworkable if you really think about it.