When you have a dream, get after it! A child's creativity should not be stifled because this world is built on dreams from people who were once children.
Example; Michio Kaku he built a particle accelerator in his garage as a teen. He's one of the most gifted physicists of this time in history. What if his mom said no?
Take out friend here, he is a budding engineer, not a mindless and reckless kid.