Reward them by letting them take practice swings. All you need to do to get them going on the golf swing is to show them the right grip, setup and basic swinging motion. I always use a 10-finger, or baseball grip with kids, which provides maximum power and feel. Teach them to stand with their feet about shoulder-width apart and with a straight spine, bending from the hips. Then, demonstrate a simple, smooth swing, counting out the rhythm as you swing back and through.
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.