Well, make sure you're there to stop him when he goes up to receive.
That is even worse for him. Again, whether the priest gives him communion or he grabs a handful for snacks, he commits a mortal sin.
It’s like a insincere confession, he only makes it harder and harder for him to repent in time. Pray before him he realizes this and asks for forgiveness in time. He doesn’t have much at his age.