Firstly, it seems the issue of your nephew no longer playing FFXIV has been resolved, which is what I would have recommended. An MMO is not an appropriate place for someone of that age, at all.
Secondly, I'm not sure what the issue is? If he's not going to play the game anymore (I would ensure this is the case if his father is not comfortable with it), what's the problem? Just delete it.
Secondly, I'm not sure what the issue is? If he's not going to play the game anymore (I would ensure this is the case if his father is not comfortable with it), what's the problem? Just delete it.