Mont. Code Ann. § 72-2-411
72-2-411 Applicable law
72-2-411 . Applicable law. This part applies to the estate of a decedent who dies domiciled in this state. Rights to homestead allowance, exempt property, and family allowance for a decedent who dies not domiciled in this state are governed by the law of the decedent's domicile at death.