Minn. Stat. § 260C.328: CHANGE OF GUARDIAN; TERMINATION OF GUARDIANSHIP.

(a) Upon its own motion or upon petition of an interested party, the juvenile court having jurisdiction of the child may, after notice to the parties and a hearing, remove the guardian appointed by the juvenile court and appoint a new guardian in accordance with section 260C.325, subdivision 1.

(b) The authority of a guardian appointed by the juvenile court terminates when the individual under guardianship becomes age 18. However, an individual who has been under the guardianship of the commissioner and who has not been adopted may continue in foster care or reenter foster care pursuant to section 260C.451 and the responsible social services agency has continuing legal responsibility for the placement of the individual.