We'll create fresh WordPress site with Multiple Passwords for Protected Pages installed. You have 20 minutes to test the plugin after that site we'll be deleted.
You can now add passwords as many as you need on every protected page.
Why? Because you can protect page and give your client a personnal password, not just a random pasword or everyone.
Option: If you are logged as admin or the page’s author, you won’t need to enter password.
Option: If you set a list of child pages, just change any password (parent page or any child) and all the password for the hierarchy will be updated!