Have you tried using the forgot password feature on the self-serve site? If that doesn't work, then your son's account may need a password reset with the help of a moderator. In that case, you should send a private message to a moderator for help with this. How to contact moderators:
http://productioncommunity.publicmobile.ca/t5/Knowledge-Base/Updated-Contacting-our-Community-Modera...
Since password resets are time-sensitive, and private messaging is the moderators' preferred communication channel, I recommend you turn on e-mail notifications for receipt of private messages in your community account. To do this, go to Settings -> Preferences -> Private Messenger. Tick the checkbox for "Receive email notifications for new private messages" and click save after making the change.
