What happens to my copyright after I die?
Copyright lasts until 70 years after the creator's death. These rights are inherited by the heirs, unless the creator arranges otherwise through a will. In that will, for example, you can designate one of the heirs who is authorized to act as a representative on behalf of all the heirs.
Unlike copyright, moral rights expire when the creator dies. Moral rights protect your personal connection to your work. These include name attribution and protection against unwanted alteration, mutilation or impairment of your work. If you want your heirs to exercise these rights, then you must explicitly arrange for this in a will or Codicil. With such a Moral rights codicil, heirs can more explicitly oppose any impairment of your work.
An example of a codicil can be found here.