Generally speaking, it’s illegal to use government access for personal reasons. Now if you are talking about civilian parents:

Put TailsOS on a thumb drive. No traces left of your activities once the drive is unplugged.

Watch for basic consumer level spyware on your smartphone.

No vpn. Use Tor either through TailOS on a laptop/desktop or Orbot and Tor browser on a phone.

Don’t talk in your sleep.

Get comfortable lying.