Administrator accounts cannot remove another parent from Classlist. Instead, you can disable a parent account. From a school's perspective, this has the same effect, denying the parent from accessing content on the school. The parent will, however, be able to log in to access any other schools they are not disabled on and/or apply to join new schools. They will also be prompted to delete their own account if they still will.
How to disable a parent
To disable a parent, visit the 'All Parents' page and select the parent that you wish to disable.
In the top right-hand corner, you will see the disable function, simply click the 'stop' symbol, the parent will then receive a notification.
To re-enable a parent
If you ever need to re-enable a parent, simply click the green tick, the parent will then be able to access their account.