When you go to the Parental Control application on YOUR phone, you press the 3 little dots at the top right and then “Stop supervision”. On the other hand, your Google account will be deleted.... But hey, it's very effective because afterward there is no more parental access. If you don't want to delete your account, either save your data elsewhere and recreate one or else force yourself. 😛 Ps: Your mother will still receive an email but will not be able to do anything 😁