It's a bit difficult to explain about bitcoin, who are completely new to this world. Basically, people think that someone has full control of bitcoin and they are manipulating its price. From my personal opinion I can suggest you to share some information regarding bitcoin and blockchain network online with your family member or loved one rather than explaining everything from scratch yours from the very first time. There is a lot of knowledge about bitcoin and cryptocurrencies on the internet. All it takes is for them to realize that bitcoin is decentralized and its community in control. I think this difficulty is due to people's different understanding and their level of interest and enthusiasm towards bitcoin and cryptocurrencies.