Only people with zero ideas about bitcoin would consider it fake money. Even though bitcoin is digital, it's still real money with real value, nonetheless. You can show your nephew how you can easily convert your bitcoin to dollars and cash it out in front of him at an ATM. Personally, I don't really have the time to educate others about bitcoin, tried that before with my closest relatives, but none of them took the risk of investing. Having said, bitcoin is yet to be fully accepted. There's still a huge percentage of the population who knows squat about cryptocurrency.