Showing someone you are passionate about something and teaching that - passion... THAT is the best thing you can do for a young mind. The worst outcome is that they are not interested long-term but harness what they learned from you into something else. The best outcome is that they love it and eclipse you at some point earlier in their own careers.
I'm not a parent either, but even if my nieces choose other fields (odds are they will), they will be better off for having some technical training before doing so: they will dig far deeper than what's required because they were trained to think that way. One of my nieces is an artist. She could draw better than I could as an adult at 12 and I had formal training in industrial design! Showing her that code is just a lower level of artistic expression is something I wish someone would have told me at her age. Doesn't matter to me if she goes into ID, UX, SD, or CG. I don't believe you can have too much directed exposure.