Please never have children or train other's.
Why? There's two ways to learn, either by listening or by experience. My son did the same thing, he wanted to hold a semi auto with a revolver grip. I told him a few times that it was a bad idea and showed him a proper grip. As soon as I backed off, he adjusted his grip, fired, and learned, through experience, that I was right.
My dad had a saying, "When you feel the heat, you see the light".