I'm gonna bet $100 that this didn't really happen.
It is possible that this story is fictional. If the author confirmed the said photo of the
BTC-logo on the sand, drawn by children, then there would be no doubts. @Fuso.hp said that there was no mobile connection in that place, but he had a phone with him, if he could determine this. If I was in that place at that moment and wanted to tell this story, I would definitely take a photo to support what was said with evidence.
Even if this story is true, drawing the
BTC-logo by children means nothing. They can switch to other games the very next day and doesn't mean that they will become bitcoin-enthusiasts when they grow up. As children, many played pilots or sea captains. How many of you have become them now?
Agree, a photo will prove some of our doubts about the story. After all, there's nothing wrong with taking photos to demonstrate the legitimacy of Op's story. But despite what the Op and the story say, we're pretty limited on this one. Given that if it is true then their parents are trying to introduce Bitcoin in a simple way like a picture while the rest I still doubt if the child's parents explain Bitcoin in its entirety. Then if this story is just an essay to attract our attention, at first glance it might make sense but because there is no evidence of pictures on the sand we only respond to it as a fictional story.