Supreme Court: IPRA Customary Laws Do Not Oust Regular Courts in Mixed-Party Disputes

The Supreme Court recently dismissed a petition for mandamus filed by spouses who claimed to be members of an indigenous cultural community (ICC) and sought to stop the execution of an unlawful detainer judgment against them. The case clarifies an important limit on the Indigenous Peoples Rights Act of 1997 (IPRA): customary laws and the National Commission on Indigenous Peoples (NCIP) do not automatically take over disputes when one party is not a member of the same ICC. The ruling also reaffirms the strict requirements for a writ of mandamus and the doctrine of immutability of final judgments.

The Facts of the Case

The dispute began in 2014 when Kristoffer Co Uy filed an unlawful detainer complaint against Spouses Elvin and Jocelyn Sending. Co Uy claimed he owned a parcel of land in Liloan and Consolacion, Cebu, and that the spouses occupied it only by his tolerance. After demand letters were ignored, he sought to eject them.

The Municipal Circuit Trial Court (MCTC) ruled in Co Uy's favor, ordering the spouses to vacate. The Regional Trial Court and the Court of Appeals (CA) affirmed with modifications. The CA decision became final and executory in November 2021.

It was only during execution proceedings in 2023 that the spouses first claimed to be members of the Lumad KKK-Alimaong Tribal Government. They argued that under the IPRA, customary laws should govern the dispute, and that the tribal court—not the MCTC—had jurisdiction. They filed a petition for mandamus directly with the Supreme Court to stop the execution.

The Court's Ruling

The Supreme Court dismissed the petition on several grounds.

First, the spouses violated the doctrine of hierarchy of courts. While the Court has concurrent original jurisdiction with the RTC and CA over mandamus petitions, direct recourse to the Supreme Court is discouraged. The spouses failed to show exceptional circumstances justifying a direct filing.

Second, mandamus was not the proper remedy. A writ of mandamus compels only the performance of a ministerial duty—one that is clear and definite and does not involve discretion. Resolving motions, interpreting laws, and determining jurisdiction are inherently discretionary acts. At most, mandamus could compel the judge to resolve a pending motion, but not to rule in a particular way. Since the MCTC judge had already resolved the motion against the spouses, mandamus was no longer available. The proper remedy would have been certiorari.

Third, the NCIP did not have jurisdiction. Citing Unduran v. Aberasturi, the Court explained that under the IPRA, the NCIP has jurisdiction only over disputes arising between parties belonging to the same ICC/IP. This is because the law requires exhaustion of remedies under the parties' customary laws and a certification from the Council of Elders—conditions that can only be met when both parties share the same customary law system. Subjecting a non-member to another group's customary laws would violate fair play and due process.

Here, the spouses claimed membership in the Lumad KKK-Alimaong tribe, but nothing showed Co Uy belonged to the same tribe. Jurisdiction therefore properly remained with the regular courts.

Finally, the spouses' claim of indigenous status was dubious. They raised it only during execution, years after the case began. They never mentioned it during barangay conciliation or in the earlier proceedings. Moreover, the NCIP had issued an advisory stating that the Lumad KKK-Alimaong Higaonon Tribe was not among the ICCs duly validated and recognized by the NCIP. The Court found the invocation of IPRA to be a "mere subterfuge" to evade an otherwise final judgment.

Practical Takeaways

• IPRA does not automatically displace regular courts. The NCIP's jurisdiction under the IPRA applies only when all parties to a dispute belong to the same ICC/IP. If parties belong to different ICCs or one party is a non-ICC member, the regular courts retain jurisdiction.
• A bare claim of indigenous status is not enough. Membership in an ICC must be substantiated with facts showing the group's customs, political structures, and institutions. Belated claims raised only to delay execution will be treated with suspicion.
• Final judgments are rarely disturbed. The doctrine of immutability of judgment means a final and executory decision can only be set aside under extraordinary circumstances, such as a clear showing of lack of jurisdiction.
• Mandamus has strict limits. It compels ministerial duties only. It cannot direct a judge how to rule on a motion, and it is not available once the judge has already acted. The proper remedy for an adverse ruling is certiorari.
• Follow the hierarchy of courts. Even for extraordinary writs, litigants should generally file first with the RTC or CA unless exceptional circumstances justify direct recourse to the Supreme Court.

This article is general information and not legal advice. For your specific situation, consult a lawyer or ask ASG Legal AI.