Ask HN: Teaching Robotics to a 5 Yo

Hello, my 5 yo child is very interesting in robotics. Wall-e is his favourite hero. Can you point me to any resources in the internet so I can teach him robotics? I'm an EE but I don't have much experience in robotics (much less in children's robotics). Are there any standard books for example that they use on the various "robotics for children" classes that exist?

Thank you