This app was mentioned in 2 comments, with an average of 1.50 upvotes
He said previously that it's an app called covenant eyes that is downloaded on his phone and his parents.
Edit: I believe this is it https://play.google.com/store/apps/details?id=com.covenanteyes.androidservice
You may want to take a look at Covenant Eyes. It allows you to lock specific apps, etc. https://play.google.com/store/apps/details?id=com.covenanteyes.androidservice