I do understand about your problem and your parents seems like a reasonable man, most of the older man prefer their investment that already proven like gold or land, and to be honest it's more secure, bitcoin still in a very early there still so many problems and controversial, we still don't know how long it can survive but for a short term bitcoin provides a very good source of profit, it grows faster than anything in this world, so it's all about how you used the opportunity for yourself,the choice will become clearer as the time goes
I do agree with your statement here. While we are very much open for new innovations it does not mean that we have to discard traditional investment vehicles around like a good house and lot, a parcel of land and even stocks for that matter. Bitcoin is getting to be popular and it shoot itself in value for the past many months yet compared to other investments it can still be considered as relatively new and there can some perils with that. Bitcoin has an intrinsic value but just all forms of currency it is all tied to people's faith on it. We are looking ahead into the future with Bitcoin yet we don't want to overlook some realities affecting the digital currency because after all is said and done we still have to be based on the reality.