The Rhode Island Petition for Commission — Will is a legal document used to appoint a commissioner for the signing of a will. This document is used to appoint someone to sign a will on behalf of a testator if he or she is unable to do so. There are two types of Rhode Island Petition for Commission — Will: 1) Single Petition for Commission — Will and 2) Joint Petition for Commission — Will. The Single Petition for Commission — Will is used when only one commissioner is needed, while the Joint Petition for Commission — Will is used when two or more commissioners are needed. The document must be signed by the testator, the appointed commissioner(s), and two witnesses.