N.M. Stat. § 45-1-303
Venue; multiple proceedings; transfer.
A. Subject to the provisions of Sections 45-1-302 and 45-3-201 NMSA 1978 and
Chapter 45, Article 5 NMSA 1978 and the Uniform Adult Guardianship and Protective
Proceedings Jurisdiction Act [Chapter 45, Article 5A NMSA 1978], if a proceeding under
the Uniform Probate Code could be maintained in more than one place in New Mexico,
the court in which the proceeding is first commenced has the exclusive right to proceed.
B. If proceedings concerning the same estate, protected person or trust are
commenced in more than one court of New Mexico, the court having jurisdiction in
which the proceeding was first commenced shall continue to hear the matter and the
other courts shall hold the matter in abeyance until the question of venue is decided. If
the ruling court determines that venue is properly in another court having jurisdiction, it
shall transfer the proceeding to the other court.
C. If a court finds that in the interest of justice a proceeding or a file should be
located in another court of New Mexico having jurisdiction, the court making the finding
may transfer the proceeding or file to the other court.