Silly question. No one can deport an American citizen.
If you deport the parents, then obviously the kids will go with their parents, thats only logical. But that isn’t a deportation, its what families do. Nobody is going to abandon their kids in a foreign country when they return home, at least no one with any decency.
Now, when the kids are of age and want to go back to the US, thats their business.
Hmmmm, that is true. But if Congress were to revoke that erroneously granted citizenship, it would be a different story, would it not...?
Another way to address it would be a Convention.
They can do it retroactive, or not....
My preference would vary with enactment of a total suspension of all immigration for a period of years, (at least one generation)