Take it from Satoshi's mouth: "If you dont believe me or dont get it, I dont have time to try to convince you, sorry".
Personally, my family doesn't get the need of it because "oUr LoCaL mOnEy iS FiNe"; and the typical criticism that it's not physical; and if I'm going to try to defend it, they're just like "ehh ok". So basically, they're not interested. So what do I do? Just go throughout my day normally. You really just cant get everyone to be interested in such a niche subject.
Some people take longer to fully understand things, especially if they're initially skeptic. I'm sure sooner or later they'll hear or read about it somewhere and want know more. Your job is to be there when they have question.