N.M. Stat. § 45-1-403.5
Appointment of representative.
A. If the court determines that an interest is not represented under Chapter 45
NMSA 1978, or that the otherwise available representation might be inadequate, the
court may appoint a representative to receive notice, give consent and otherwise
represent, bind and act on behalf of a minor, incapacitated or unborn person, or a
person whose identity or location is unknown. A representative may be appointed to
represent several persons or interests.
B. A representative may act on behalf of the person represented with respect to any
matter arising under the Uniform Probate Code, whether or not a judicial proceeding
concerning the estate is pending.
C. In making decisions, a representative may consider the general benefit accruing
to the living members of the person's family.