Android smartphones, typically have a default, pre-installed browser (additional others like Chrome, Firefox, etc. can be added afterwards). The YouTube app is often pre-installed. In a unrooted Android device, it is not possible to uninstall factory pre-installed applications.
I now refer to the description of Norton Family at Google play which mentions: "IMPORTANT NOTE: Please disable any other browser and the YouTube app so that your children’s activity can be monitored."
Could you please clarify what exactly you mean by "disable any other browser and the YouTube app"? Which browser(s) should be disabled and how? Where does the word "other" refers to? (if so, which browser will the user be using?) Also, how to disable the YouTube app"? (if so, how will the user be viewing YouTube videos?).
Thanks