And the password may, depending upon circumstances, be either his Admin password or a completely different Apple ID password.
I would't want anyone reading these forums to imply that to be a suggested practice. In fact it would be condemed by anyone with the slightest knowledge and concern about secuity.
(I use
1 Password 7 as my password manager and it red-flags every instance of a re-used password and nags me to change one or both. It also nags me to change passwords periodicallly. When I started out I had four or five passwords ued everywhere. After a couple of year of nagging I now have over a
hundred unique passwords. I only actually remember four or five of them and leave the rest to 1Password 7 and Keychain. There are less than fifteen or twenty of those I consider sensitive enough to change on a regular basis.)