you dont want to push them into it to much its got to be something they want to do not something you want to make them know, if there not interested in it then all i can suggest is bring the topic up from time to time, sadly bitcoin isnt something even tech savvy kids get into very often as its not something they can get a reward from, you dont really see much happen with crypto currency and if you do as a kid its almost impossible to spend what ever money you manage to scrape together, hell even as an adult its hard to do anything more that a hobby as big miner have take all the fun out of mining.
dont get me wrong i love bitcoin but only because i got into mining when you could use you PC and earn a profit, theses days theres almost no chance