Over time, when they have the bandwidth and the need to study Bitcoin, they will remember where they first heard about it.

You might simply say, "No problem, I didn't want you to berate me in a couple months for not nudging you a little harder. It's OK with me whatever you choose, I'm here if you're ever ready to know more. I've taken you to water and can't make you drink. So, you do you and I'll do me."

Then, just for yourself and for your own sanity, remember Satoshi's words...