We are born into the world as a block of marble. Somewhere inside of that block exists our highest self, the raw potential of our destiny. If we're open to it, the Universe presents us with experiences that work away at that block to reveal who we're meant to be.
Tell them they have made a difference in your kid's life, or your life, or both. Tell them how and why. Be specific. Just tell them. Because knowing that you made a difference in someone's life is, hands down, the best gift of all.