Children can imitate anything. You'll be surprised how quickly they catch on. Let them hit some wiffle balls to experience the feeling of contact. Kids don't have the same problems that adults have in learning the golf swing. We think too much, worry about angles and positions and the like.
Kids just stand up to the ball and go at it.
We could all learn something from their approach. But once they've begun to try to hit the ball, you'll want to help them become more consistent. You don't have to be a teaching pro to do this. Focus your instruction on balance and rhythm. Once they learn to stay still and swing back and through in good time, they'll be getting the ball airborne, and they'll be figuring out things for themselves even faster than you can teach them.