R.I. Gen. Laws § 33-5-4: Nomination of guardian by will.

Every person authorized by law to make a will may nominate by the person’s will a guardian or guardians for the person’s children during their minority, and a successor guardian or guardians for persons with intellectual or developmental disabilities as defined in chapter 22 of title 40.1 for whom the person had been appointed guardian during the person’s lifetime, and the probate court shall appoint the guardian or guardians unless good cause be shown to the contrary; provided, that, in the case of husband and wife, the survivor, being otherwise qualified, shall be the guardian of their children.