Mont. Code Ann. § 31-2-105

When a creditor is entitled to resort to each of several funds for the satisfaction of the creditor's claim and another person has an interest in or is entitled as a creditor to resort to some but not all of the funds, the the other person may require the creditor to seek satisfaction from those funds to which the other person does not have a claim so far as it can be done without impairing the right of the creditor to complete satisfaction and without doing injustice to third persons.