Are you saying the mother’s natural born citizenship is worthless when she is out of the country?
I think the concern is that she showed up on Canada’s voter rolls while they were in Calgary. So, the argument goes, she may have “become a Canadian” while they were there, and had the intent of staying forever.
But then they went back to the US and once back here, she changed her citizenship from Canada to the US.
I have no earthly idea if that is true. But I “think” that is the concern.
If they renounce it, yes it is.
In fact until 1934 Ted Cruz would not have even been considered a citizen of the USA. A natural born citizen requires no laws to make them a citizen they just are. Cruz citizenship depents on naturalization act passed by Congress. He was naturalized at birth via Congressional legislation. He is NOT a natural born citizen if we follow original intent.