wrong icloud email address

I have a bit of a problem... actually it's on by bosses iPhone 5 and he has come to me for an answer His iCloud (iForgot) nag screen keeps coming up to ask him for his password, but it's asking him for a password to a wrong email address he mistakingly entered. So now when I try and reset it, on Apple.com, it asks if I want to get a password reset by either a security question... Or by sending an email to an email adddress on file with Apple. When I try the security question option, it asks for his birthday, which when entered, does not work and if I try the option to have a new password sent through email, it's obviuosly going to a wrong email address. Is there a way to reset this by having a password reset sent to an alternate email address of his?