Mont. Code Ann. § 70-28-214

No judgment in any such action shall be given by default, but the court must require proof of the facts alleged in the complaint and other pleadings, and the court must further make diligent inquiry of the plaintiff and all defendants appearing concerning the next of kin of said deceased entryman, and upon such examination should any heir be discovered who has not been served or who has not appeared, the court may order such heir brought in if necessary for the determination herein provided for.