Well... parents tend to be like that. My mother was horrified when I began talking about lucid dreaming. She thought it was something occult. I didn't know what it was either (before the internet), and there were aspects (of WILDs and FAs) that I didn't like, but the lucidity and dream control - those were great, and I was just trying to find out if other people had them too. Clearly, my parents didn't. My dad still calls it "humbug" - and I gracefully ignore the implied accusation of either being a liar or insane - but in my lucid dreams I make him believe me. And I told him this IWL, just to annoy him.
In your case, though, the best policy is probably just to leave them to their beliefs. If they won't take 15 minutes to google the science behind this, just leave them in ignorance. You have a huge online community supporting you, and although it would be even greater to be able to talk about this IRL, the majority of people don't know about it, don't understand it, or don't care.
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