Hey MM -don't know if you saw my reply to your facebook status but get DF to email them or call them and authorise you as a contact on the account. That way you can deal with it.
We had to do this on all of DHs accounts etc when he had his big accident years ago and couldn't talk for weeks. If they don't accept it over the phone or email then a faxed stat dec type thing with his signature should do it for sure. Good luck