How do I communicate with Apple Support to delete a deceased family member's account?

It is explained here with the proper steps to take. Scheduling an appointment at an Apple Store will do no good. They won't be able to access or delete the account.

How to request access to a deceased family member’s Apple Account - Apple Support

Schedule an appointment:

iPhone Repair and Service - Apple Support

Hello~ As *Mac Jim ID* points out scheduling an appointment will do absolutely no good . Click on and follow the highlighted link that they correctly posted for you. You have my condolences on the loss of your father. Take care.

~Katana-San~