What is a Letter of Instruction in a Michigan Estate Plan? To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account.A letter of last instruction is a common estate planning document that allows you to communicate to your family all the facts about your personal life. A Letter of Last Instruction is an organized way for you to give your family direction on information that may be difficult to find after you've passed. 3. No real property is included in the decedent's estate. 4. Learn what happens in a probate estate in Michigan after a person's death. From the Probate and Estate Planning Section of the State Bar of Michigan. Use our Affidavit of Death form to verify the death of a family member and help with the inheritance process. In this blog post, we'll talk about why it's so important to open an estate, the documents needed to open an estate, and how to start estate administration. Send the completed form to your local SSA office.