How do I disable Family Sharing?

The instructions to disband a family sharing group are in the support document Leave Family Sharing, in the section called Disband a family group.

On your iPhone, iPad, or iPod touch

1. Go to Settings.
2. Tap your name, then tap Family Sharing.
3. Tap your name.
4. Tap Stop Using Family Sharing.

Additionally, read the note: When the family organizer turns off Family Sharing, all family members are removed from the group at the same time. If there are children under 13* in the family group, the family organizer can't disband the group until they move the child to another Family Sharing group.

* Age varies by country or region

What is Family Sharing?

If this iPad was enrolled to Family Sharing by another Family Member who controls this device - the user ( you ) need to talk to that person about removing this device from this plan.

Join a Family Sharing group in Family Sharing on Mac

If the user ( you ) are that emphatic the device was hacked ( questionable at best )

1 - Checklist: If you want to see if anyone else has access to your device or accounts

2 - Two-factor authentication for Apple ID

3 - Log into https://appleid.apple.com/ and change you Apple ID Password

4 - Visit a Genius at an Apple Store and have the Experts Evaluate this device