I have an deleted admin user on my Mac, but need to know if I can permanently delete the user name and the home files data (my son)? When he deleted his account, he didn't delete his files and I don't want to accidently lose my files.
You can remove a deleted user account without losing your files. If the account has already been deleted then navigate to the /Users/ folder and look for a Deleted Users folder. Drag the folder to the trash then empty the trash.
If the account has not yet been deleted then open Accounts preferences from your admin account, click on the lock icon and authenticate, select the account you wish to delete and click on the ,Delete [-] button. Select the option to completely remove the account.