I'm not going to judge people who are comfortable with their kids playing MMOs. By 9, he's able to discuss most issues that come up, but I think the usual lower age limit for these things is 13? Even then, unsupervised internet communications can be a scary thing.
In any case, if I were in your situation, I'd just let the character sit there and collect dust, unless there was some compelling reason to use it that isn't immediately evident. Even if the character's on a separate account, better to just let it lapse and leave it there indefinitely. With a level 5, you'd be better off rerolling something new to play (or even saving the appearance data and giving it the same name) than bothering to transfer it.
In any case, if I were in your situation, I'd just let the character sit there and collect dust, unless there was some compelling reason to use it that isn't immediately evident. Even if the character's on a separate account, better to just let it lapse and leave it there indefinitely. With a level 5, you'd be better off rerolling something new to play (or even saving the appearance data and giving it the same name) than bothering to transfer it.