If they see you learning, they are likely to learn from your example. Nagging for sure doesn’t work.
Rav Chaim Kanievsky, Shlita, said that he can learn for several hours, but if someone were to tell him to learn, he wouldn’t be able to learn for more than a few minutes.
Keeping the house distraction free (tv free, internet free, etc.) helps too. And sending them to the right schools (although which schools are the right schools depends on child and on family).
Also, I imagine that if they always hear you speaking positively and with admiration about our Gedolim, they are likely to want to be like them.