I'm not going to tell them about the the decentralization thing and it's advantages compared to conventional paper money. Probably the only thing I would tell them is that bitcoin can function similarly like what you have or can do with money. It's not free and you have to earn it. That's the farthest I would go to let them know about bitcoin.
Yeah, that is the best thing to do, we need to tell them the importance and efforts made to earn bitcoins, we need to tell them it requires great level of efforts to earn bitcoins, only showing them the advantages of holding bitcoins will not serve the purpose, so it is better we start from the basic step rather then showing them the value and benefits of bitcoins.