If you have multiple device, (in the same account), and when you buy a book, all those devices will receive it. So you are your kids can read them at the same

If you have multiple device, (in the same account), and when you buy a book, all those devices will receive it. So you are your kids can read them at the same time. Get a family account and login with the kindles on that, so your kids will enjoy your books too. As for more advanced features, it is still a very early market, and features are coming one by one. Give it time.