Mont. Code Ann. § 72-26-701
Powers of custodian
72-26-701 . Powers of custodian. (1) A custodian, acting in a custodial capacity, has all the rights, powers, and authority over custodial property that unmarried adult owners have over their own property, but a custodian may exercise those rights, powers, and authority in that capacity only.
(2) This section does not relieve a custodian from liability for breach of 72-26-702 .