Please improve parental control to block adult content via the network not per device/MAC address. Phones randomize the Mac now. And you can't expect users to know how to change this on their phone to use this phones Mac only nor should you. It's far to easy to just keep it as randomize the Mac. Then their not going to be filtered. 
 

so please make some adjustments to the parental control. It needs to have the ability to protect and filter the network not by MAC address.