As much as I love Google (not even a little, my love for that company is negative and becoming more negative per second) I would love to run far far away from it. Here’s another ball and chain I need to break.
Where can I find a simple parental control access system for my phone and or computer that I allow my kids to use?
For your computer: https://help.ubuntu.com/stable/ubuntu-help/parental-controls.html.en
For the Phone I’d create a second profile on the phone and only install the apps there which I’d allow my children to use.