I've never pushed coding on them as anything that they "have" to do, but when they're not using their tablets for school I give it to them as something they can do for fun and so far so good on that front. They both enjoy it enough they they tell their teachers they want to work together as coders later in life.
That's awesome! I recently discovered that an old colleague of mine quit his lab job some years back and started a program teaching coding to elementary kids. You'll have to tell me how it goes!