Many parents have had their kids say something on the radio at least once in the ATC business. How many, I don't know, but more than this one.
In my FAA ATC days, I was working at a facility where a fellow employee let his daughter talk on the radio in a tower. I was the union (NATCA) representative, and met with the manager who proposed a 3 day suspension.
I got it down to 1 day. Seemed like a good outcome.
But, like pilots overflying airports, that has happened many times before. But when two very unlucky Northwest pilots did it last year, they were not only fired, but their professional pilot licenses were revoked (not just suspended).