I second this. I'm a father of a 5½ year old boy. Like the grandparent said, I try to treat him as an adult with no experience, knowledge or skills and with a plastic mind.
Small kids have an instinct to learn: they follow you around and copy your behavior. It takes great responsibility to shape the future of a person. And with your own flaws replayed in front of you, you change, you become a better person because of it.
I remember that age. And I loved when I was doing stuff with my dad. Before I was 7 I had worked with wood, handled the axe and knife, welded metal, messed with bikes, capsized a boat, tied knots and shot rifles. I wasn't good, I didn't contribute, I was just given small tasks to free my dad to do the real work. I felt I was on the team, and I learned a lot.
My father always answered all my weird questions, and if he wasn't able to, he looked it up and told me at bed time.
When I was 12, and enthusiastic told him about a game have played on my Commodere 64. He listened and was understanding of my enthusiasm. Then he said: "But did you program that game?", and I replayed "No, of course not...". And my Dad replayed: "So you are only running other peoples programs...". That sentence is the reason I'm in IT and reading this site...