Open the Family Link app on the parent device
Select the child account
Tap Controls
Tap Account settings
Tap Account info
Tap Delete account or Stop supervision
Follow the on-screen prompts to confirm
If the child is 13 or older, use the child’s Google account settings to remove supervision
If the child is under 13, remove the child account from Family Link through the parent account
If needed, sign in to the child’s Google account at myaccount.google.com
Go to Data and privacy
Find Delete your Google Account or remove Family Link supervision options
Confirm the changes with the required password or parent approval