Final answer:
To ensure his cremation wishes are carried out, a man should create both a Funeral Planning Declaration and an irrevocable preneed contract, which allow him to detail his final wishes and make arrangements that cannot be easily changed.
Step-by-step explanation:
To ensure that a man's wishes to be cremated are respected, despite it being against his family's wishes and their religious beliefs, the man should consider creating a Funeral Planning Declaration and an irrevocable preneed contract. A Funeral Planning Declaration is a document that allows an individual to outline their final wishes regarding their funeral and the disposition of their body. An irrevocable preneed contract is an agreement made with a funeral service provider that makes arrangements for funerals, cremations, and other services in advance, and once signed, cannot be changed without the consent of both parties.
A Health Care Power of Attorney is useful for making medical decisions on someone's behalf if they become incapacitated, but it does not specifically address after-death arrangements like cremation. Therefore, the best ways to ensure one's funeral wishes are carried out would be by a combination of creating a Funeral Planning Declaration and an irrevocable preneed contract (Option E); these legal instruments are designed to uphold an individual's final wishes concerning their bodily disposition after death.