Do not see the point
For the same amount of money you:
0. Get the normal kindle.
1. Get the kindle cover - it is a must, even if an adult will be using it
2. Talk to your kind not to be stupid and remind him that the email invoice about any of his purchases lands straight into your email account.
Works fine - tested on a 13 (for 3 years now) and a 6 year old (for about a year). The only "downside" is your expense bill. It is surprising how quickly can the numbers rack up (especially if you teach your kinds speed reading). A month with a lot of travel can cost you something in the 90£+ for "book budget".
However, I will take that "downide" any day and double it :)