SE or Microsoft won't do anything about this. I've seen similar threads on Reddit, and they were all like "Your problem, make a new account."
I'd honestly don't know what advice to give you. Unless your father wants your character deleted, I'd just keep them? Maybe when he isn't playing you can still log onto those characters, while in the meantime you level them up again on another, new account? I don't think anyone is going to get their panties in a twist if you changed their last names or something.
Doesn't solve the issue you can't go on Balmung though.
That said, I believe your father's account can at least RAF you, so that's something to keep in mind to when making a new account!
To be fair, I'd have a chat with your father about it and see what he wants you to do.
I'd honestly don't know what advice to give you. Unless your father wants your character deleted, I'd just keep them? Maybe when he isn't playing you can still log onto those characters, while in the meantime you level them up again on another, new account? I don't think anyone is going to get their panties in a twist if you changed their last names or something.
Doesn't solve the issue you can't go on Balmung though.
That said, I believe your father's account can at least RAF you, so that's something to keep in mind to when making a new account!
To be fair, I'd have a chat with your father about it and see what he wants you to do.