Passing Family on Android by guest account

Hello,

 

My kid is passing Norton Family on his tablet by using the guest account. I do not recieve a warning we he does. What can i do to monitor him?

Tablet: Nexus 7 (Lollipop)

Kids account: Owner, with Norton Family installed and properly working. I don't want to give him a restricted user account, because than he can't use his Google mail, agenda, plus etc anymore.

Please help!

TvanH