As a Parent, you can deactivate your own account from the Account Settings page.
Click on the Account icon and then Settings .
Scroll to the bottom of the page and click Deactivate your account.
Read the warning and click Deactivate.
Note: If your student joins new Groups, you will automatically see them in your account. There's no action required by you. However, if your student created a new Student account, you can link your existing Parent account to your student's new account. Learn how to Add a Student or Remove a Student.