WOW Can't believe how unwilling to help SONY and Square are

[Darkstride]

Before your your PSN and SE accounts are linked during the installation & registration phase, a warning screen does tell you that once you link the accounts the process cannot be undone. It does remind you that if multiple people use the system, you need to make sure that you are using the personal account that you intend to use whIle playing the game.

http://na.finalfantasyxiv.com/pr/sta...3/has_account/

Hopefully you can get this sorted out and it works in your favor in the end, however I don't think it's fair to blame SE or Sony given that it was user error to begin with. Best of luck to you.

As others have stated, you could just change the restrictions on the account you need and create another one for your son to use.