I will advise you to allow that child to reach 17 or 18 years before you can teach the child how to trade, which it will really help the child to catch up with so many things that will help him or her to have a good skills of crypto trading in the market. I don't think, a child from 10 to 15 years is advisable to start trading because they will not have the knowledge to take the risk of holding like 5 or 4 years before they can sell which will be very difficult for them to accommodate at that age in the community. I know you want good thing from your kids, but allow them to reach 18 years before you can do everything possible to ensure they learn how to trade to become a potential trader in the society.
There is nothing wrong in teaching kids, if only it will stop at teaching and not allowing them practice it. They should only be given lice trading account when they are of age and maybe have started to earn and can make and handle decisions independently.
Teaching your kids and allowing them to trade with demo accounts isn't a bad idea.
Check out the scenario you funded their demo accounts and asked them to keep trading, how much they gather in their demo accounts is what you will give them in real life.
Whenever they need money from you, they have to trade it out in the demo account first. This will make them master the trading and whenever a real account is given them, they must make profits.