Luke ALWAYS has a following of neighbor kids/siblings. He always has at least 3 boys following his every move. Really. Is cutting up a Capri Sun box to make a truck out of your remote control car really that exciting?
Though Luke, unlike the Pied Piper, isn't playing the pipe, and won't lead the children into a cave never to be seen again. I make no guarantees what he may or may not teach your children. It will be a long the lines of fishing, using pocket knives, making anything one can imagine, how to aim a BB gun (currently confiscated), constructing furniture with power tools or a myriad of other things.
I can guarantee though, he will not, teach your children anything that involves being inside.