give him android game faucet 
Those game are the worst games i don't know if you have ever tried them but those are literally filled with ads it was basically impossible for you to click the claim button as 3-4 banners pop up. If we actually had to teach are children about bitcoin we should encourage them to buy bitcoin using the their savings and tell them how the price of your initial money increased.Unfortunately, most newbies choose to go the hard way, maybe even the hardest way that they found. And it's faucet sites. Yes you can start right away but games like that are just faucet sites with some gimmick added. The banners pop-up and makes it hard for you to claim because the creator of the app wanted you to click the advertisement since that's how they earn money. They need traffic on their faucet sites to earn money from the Advertisements. Every click counts.
Children should buy bitcoins using their savings? Uhmm. How? They are kids. They barely have money and whenever they get money from their parents, they spend it right away to buy candies.