Michael Losier's book "The Law of Attraction" has a good section about teaching kids about the law of attraction. Here's a summary that I got from
this blog:
"When teaching children the law of attraction, the most important thing is to communicate with them at their level, using words they understand and relate to. ‘Manifestations’, ‘vibrations’ and ’serendipity’ are usually words that children can’t get a firm grasp on. So number one is to keep your words simple. Another tool you can use is to ask questions that get kids to relate to concepts from their own experience. For example, the simple act of using a light switch to turn on and off a light could represent the fact that we either are feeling positive emotion (emitting good vibrations) or negative emotion (emitting bad vibrations). Like a light switch, it’s either one or the other. Simple ideas like these are easy for kids to relate to."