Kids-Mobile Access to Their Own Calendar?

Good lord teenagers are busy. I don't think I was ever that busy when I was a kid. We spend a lot of time telling our kids what's going on today, tomorrow, this weekend. We spend a lot of time keeping our Google calendar up to date so that we know where they are supposed to be. Next move? Their next phones should have easy access to our online calendar. Why not? Kids get the concept so why not enable them?