Your best course of action is to contact Apple and ask for their help in sorting this out Tim.
This sort of question is a problem in the digital age. Companies are reluctant to supply information that can justifiably be considered confidential, even if the information belongs to the deceased. In any event if anyone can help it will be Apple. Since we are all just users like yourself, no one here will be able to help with account information.
Contact them here:
Navigate the options until you arrive at the ability to compose an email. It will be answered in a day or two, but be prepared for several more days of back-and-forth correspondence before you get the attention of someone who understands and can address your concerns.