Forgot security question and email

Hi me and my friend created a clan not long ago and today we decided that we wanted a clan logo so we bought it. Then he was going to turn me lieutenant, because we forgot to. But there was just one problem he had forgot his security question (what make was your first car) and therefore couldn't change much in the clan. He clicked on the "i forgot my security question" button and another problem arises. He can't remember the email he used to register. So now his account is pretty much screwed. I just want to know if there is any way we can possibly know what the security answer to it is. Both me and him should be able to prove that he is the owner of the account.
Thanks in advance.