then we will teach them what is the factors of bitcoin and where do earn bitcoin. first of all I will teach them faucet method. so they will be interested cause no money will came out on their pocket. then i will teach investing and trading.
That thing you are mentioning are teens and not toddlers. Teaching children is not easy, believe me, I know it. Beside the concept that you are about to inculcate into their mind is a bit complicated. I know that those teens love new things, they could really learn about it as a "subject" but when you are doing it at home, well it's different. They might think that you are forcing them to work for money.
If they don't want to know about this, I think better not to force them, they might have another forte.
Teachers can teach them what bitcoin is actually and how it works generally and then as you suggested children are given such online games. This all will make a better impact on their minds about bitcoin and they will love it when they become young.