As someone said earlier, 10 year old kid might be to young to understand Bitcoin. Did you explain him how "dollar" works and why he can buy for example sweets with it? Create a new address for him and make sure that the private key will be safe. You can send him some BTC, maybe he will be able to pay for his education in the future? It's never too early to think about these things. I think that if he was 13 years old, it would be a good choice to explain him how bitcoin works. Now, he may not understand what you are saying or not become interested at all.