Manage your child's Google Account with Family Link - Google For Families Help
https://support.google.com/families/answer/7103262?hl=en
Delete your child's Google Account Remove your child's account from any Android devices they're signed in to. On your device, open the Family Link app . Select your child. On the "Settings" card, tap Manage settings Account info Delete account.
Remove your child's account from any Android devices they're signed in to.
On your device, open the Family Link app .
Select your child.
On the "Settings" card, tap Manage settings Account info Delete account.
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