Mont. Code Ann. § 72-38-1007
72-38-1007 Event affecting administration or distribution
72-38-1007 . Event affecting administration or distribution. If the happening of an event, including marriage, divorce, performance of educational requirements, or death, affects the administration or distribution of a trust, a trustee who has exercised reasonable care to ascertain the happening of the event is not liable for a loss resulting from the trustee's lack of knowledge.