It is art and children love art. They draw things they know and know recently but they even don't know what it means technically. Children are hungry to discover new things and if they have fun with new things, they love it.
Children loves art and whether the story is real or fictional, the core message the OP is trying to pass is that whatever you do have a way of influencing or rubbing off on those around you. This is the case with the kid in the OP's story. Now, if this is happening with the kids, I can say that his mother will also feel the bitcoin effect. For the father to get the kid interested in bitcoin, he could start by telling the kid to recreate the bitcoin logo as well as other cryptocurrency logos. This would be a great way to spark a conversation about bitcoin.
This is like the first steppingstone on learning the bitcoin. No matter how they known it or even just seen the logo and started drawing it. For sure those kids will learn it eventually in the future as they will be curious of it. The problem really with this kind of post we cant tell if it is true or made up but i am hoping that it is true as that area even remote they will be technologically inclined
How do we ensure they will learn and research bitcoin as they grow up? You want your child to be a great soccer player, and you start teaching them from an early age. Do you guarantee that he will definitely follow the artistic path you have chosen for him and that he will definitely become a great player like CR7? My dad used to want me to be a doctor, and I still remember him talking about doctor-related things every day. But growing up, I was no longer interested in that profession, instead, I was very passionate about learning IT.
We can teach kids bitcoin but don't impose our thoughts on them, if they have passion, we can move on. If they don't like it, don't force them.