Thanks again for your patience.
I've spoken with AOL, but am afraid I do not have good news. Due to the age of the account, it was setup in such a way that it cannot be separated out from under the "master" account -- even if the original account holder were available to give explicit permission to do so. The only option in this case would be for the original account holder to reactivate their account and keep it and all sub accounts open.
I understand your situation is such that the original account owner is unavailable and, thus, even the above is not a possibility. Being so, I deeply regret to pass along the news that you will need to create a new AOL account in order to continue using their service.
I know this is not the answer you were hoping for, and it is likewise not the answer I hoped to provide. I wish I could assist further, but this does appear to be a policy issue on AOL's end that can't be circumnavigated.
On a personal note from me to you, I am so sorry for the stress this situation is causing you. It's a painful situation to deal with, and if I can be of any further assistance insofar as recommending new services to try, etc., I'm glad to offer any advice I can.