I cringe too, but the kids have to play a lot to get good, and make you 'not' cringe. So the effort, and the courage, are to be applauded. Volunteer church pianists are sometimes difficult as well as choirs, but the Book don't say "make a beautiful noise", it says, "make a joyful noise", and the spirit of the thing is what's really important at that stage. Be happy, celebrate the gifts of life !