Stop removing Norton360 and NortonFamily by a 9 year

Hello,

I have a question about Norton360 and Norton family on a android tablet. Can you have two accounts on the tablet?
I think he has setup two account perhaps admin and another account.

My son 9year  removes Norton. How can I stop this? I don't want to have child account because you run into so many
problems, but at the same time I don't want any acces to any porn or other websites that are not for kid 9 years old.

How do I setup things so I have full acess he can't remove or turn things off.