An Illinois Order Declaring Warship (also known as a Petition for Warship) is a court order issued by the Circuit Court of Illinois to determine the legal heirs of a deceased person's estate. It is typically used when the deceased person has left no will or other form of written testamentary instrument. The order is used to declare the extent of the surviving heirs' rights and interests in the deceased person's estate. The petition for warship must be filed by an interested party, such as an executor, administrator, or guardian, and must include the relevant information about the deceased person's estate. There are two types of Illinois Order Declaring Warship: Formal and Informal. Formal petitions are typically used when the deceased person's estate is large or complex. These petitions must include detailed information about the deceased person's assets, debts, and other financial interests. Informal petitions are typically used when the deceased person's estate is small or uncomplicated. These petitions do not require detailed information, but must include the name of the deceased person and the names of the surviving heirs.