Assume that you have all the evidence, that it is credible and reliable, that you are not a government official, and that the person has not submitted to government examination. What do you find as to citizenship? I would find statutory citizenship based on 1401(g), upon finding citizenship and residence of the US citizen parent. Kabar would say that citizenship didn't attach yet, because the person hadn't submitted evidence and requested a grant of citizenship.
“Kabar would say that citizenship didn’t attach yet, because the person hadn’t submitted evidence and requested a grant of citizenship.”
The citizenship is granted at birth and not when it becomes vested by satisfying the conditions needed to receive recognition and vest. Think of it like the inheritor of a vast estate who must prove identity and satisfy the conditions of the codicil before the probate can settle the rights of the estate upon the inheritor claimant.