(a) A parent with legal and physical custody or a legal custodian may designate a standby or temporary custodian by means of a written designation unless the child has another legal parent:
(1) whose parental rights have not been terminated;
(2) whose whereabouts are known; and
(3) who is willing and able to make and carry out the daily custodial care and make decisions concerning the child.
(b) Notwithstanding paragraph (a), a parent or legal custodian may designate a standby or temporary custodian with the consent of the other parent, or as provided by section 257B.05, subdivision 6.
(c) A legal custodian pursuant to a designation of temporary custodianship may not designate a different temporary custodian.