“You can’t just strip citizenship, even if the law changes or there is a clarification of the meaning of the 14th Amendment, those already recognized a citizens would be grandfathered in. You can’t make a change in the law retroactive (ex post facto law). (Article 1, Section 9 ss 3)”
It wouldn’t be “ex post facto” if a court were to rule that the law had been interpreted incorrectly at the time the children were determined to have been citizens. We would most likely still “grandfather” them in, but that would be for convenience’s sake, not by necessity.
I'm no lawyer, but wasn't the Lautenburg (spelling?) Gun Ban retroactive thereby causing many military men and police men to lose their whole careers?