In the case before the court, both parents were citizens, so they used the term parents.
But the term “parents” can easily mean one or both, and doesn’t have to mean just “both”. If the case had involved a single parent who was a citizen, we’d know for certain.
But as I have asked others, I’ll ask you. If you believe that both parents must be citizens in order for the child to be a citizen, what about the teenager who sleeps with a foreign exhange student and gets pregnant. Are you saying that her child isn’t a citizen?
Easy question to answer. Citizen? Yes.
Natural Born Citizen - ????. The term hasn’t been judicially defined.