Story time

My nephew, who is around 15 years old, has gained knowledge about bitcoin and cryptocurrencies through exposure to discussions between his father (my brother) and me, as we frequently talk about bitcoin. Whenever he has free time from school or chores, we allow him to listen in on our conversations and ask any curious questions he may have. For instance, he often asks questions like, "Uncle, what is bitcoin?" or "Is it a type of currency? Can I have one?" We do our best to explain the concept to him, but sometimes he grasps it easily while other times he struggles to understand. What I do know is that this young boy is displaying a keen interest in the subject.
Recently, he expressed his frustration about his teacher and classmates labeling bitcoin as a ponzi scheme or a scam each time he talks about it. I'm seeking a variety of advice that I can offer to my nephew in this situation. Although his father suggested that he should stop discussing bitcoin, I don't feel comfortable with that approach. What are your thoughts on this matter?
My sons also acts the same way. He always ask question about bitcoin and mostly my activities in the forum. He understands some of the concepts , while others are difficult for him to grab. But I am careful not to transfer or expose sensitive concepts like my password, username and wallet to them. Children cannot be underestimated. His father is right based on my views. Your brother might be concerned about privacy and security. If you tell anybody that you own a bitcoin in my location, they will see you as a very rich person. This can make you a target of criminals because they think you are rich.
Your nephew is in the secondary school and bitcoin education is not highly needed in his class. Most of them might not be interest and don't have the fund to buy bitcoin. My advice it that you communicate with the teacher and teach him about bitcoin. If he gets the true picture, advice him to tell the students the truth.