Ask the company or institution (like a bank) that has the property if they have an Affidavit for you to use. Begin the probate process.Discover the precise steps to secure Letters of Testamentary in California. Our comprehensive guide makes the process straightforward and hassle-free. Be sure to include names they used on title to real property, vehicles and bank accounts. In the box that reads "Estate of," write the name of the decedent. Leave the box that reads case number, hearing date, Dept, blank. The process of claiming a bank account after death varies based on a number of factors. Here's how to claim a deceased person's bank accounts. What Is a Letter of Testamentary in California?