I respectfully disagree with those who think it was harmless and funny.
I think it was distracting, highly unprofessional and potentially dangerous. JFK is a complex and extremely busy international airport handling huge traffic volumes. It is not a puddleville airport with six flights a day.
There is nothing cute, funny or humorous in allowing a child to relay any critical instructions to aircraft whether they are arriving, departing or otherwise. Many lives depend upon accurate, articulate, and intelligible instructions which must be delivered in a timely and professional manner. And if those instructions are wrong, bad things can happen. In aviation, as we all know too well, distractions are dangerous. One simple moment of inattention can result in disaster. Like the old expression goes, "it's all fun and games until someone gets hurt."
IMHO- The control tower is NOT a day care center. It is not "Amateur Hour". It this controller wanted his children to learn how a tower functions, he could have brought them in while off duty and cleared this first with his supervisor. And not allowed them to touch the microphone.
The FAA is perfectly justified in exerting its full weight in dealing with this matter of very poor judgement.