Mwangi (Suing as the legal representative of the Estate of Wanjohi Mwangi - Deceased , and on her own behalf) & 2 others v Ngari & 3 others (Land Case E001 of 2025) [2026] KEELC 3985 (KLR)
The bottom line
#A Kenyan court ruled that family land disputes based on customary trust cannot be shut down just because a succession case was previously filed over the same property.
What this practically means
#Executive summary
#Key legal issues
#Whether the suit is res judicata having regard to the succession cause and the appeal in High Court Civil Appeal No. 46 of 2018
The plea of res judicata fails because the issue of customary trust was never heard and finally determined by a court of competent jurisdiction; the probate court lacked jurisdiction to conclusively determine it and the appellate court declined to entertain it.
The court applied the five-part test summarised in Bernard Mugo Ndegwa v James Nderitu Githae and the Supreme Court's guidance in John Florence Maritime Services. While the same parties and land were involved, the determinative element of finality by a competent court was absent. The succession court exercised probate jurisdiction under the Law of Succession Act confined to administration and distribution, and Rule 41(3) of the Probate and Administration Rules permits such questions to be set aside for separate determination. The High Court appeal expressly held the customary trust issue could not feature on appeal.
Whether res judicata extends to matters that could and ought to have been raised in prior proceedings
The doctrine may capture such matters, but only where the issue was heard and finally determined by a court of competent jurisdiction; here that requirement was not met.
The court accepted the Henderson v Henderson principle as expounded by the Supreme Court that parties must bring forward their whole case, but held that this constructive aspect of res judicata cannot operate in isolation from Section 7's requirement of competent jurisdiction and final determination. Because no court competent over declarations of trust and land ownership had substantively adjudicated the customary trust claim, the constructive plea could not succeed either.
Costs
Costs follow the event under Section 27 of the Civil Procedure Act; the defendants, having failed, bear the plaintiffs' costs.
The court invoked Section 27 of the Civil Procedure Act, which directs that costs follow the event unless the court otherwise directs on good grounds. As the defendants' preliminary objection failed in its entirety, no reason existed to depart from that principle.
Legal principles established
#- Res judicata requires that the issue have been heard and finally determined by a court of competent jurisdiction; a probate court is not competent to conclusively adjudicate competing proprietary interests founded on customary trust.
- Where questions of beneficial interest in an estate cannot conveniently be determined within succession proceedings, they may be set aside for determination in separate proceedings.
- The requirement of prior final determination by a competent court cannot be bypassed even where the claimant ought to have raised the issue earlier.
Court orders
#- 1.That defendants' preliminary objection dated 10th April 2025 is without merit and is rejected.
- 2.The defendants to bear the plaintiffs' costs.
- Jurisdiction invoked
- Environment and Land Court jurisdiction over disputes relating to ownership and interests in land, including customary trust
Key timeline
#Practical implications
#Frequently asked questions
#Cite this brief
#Cite this brief
Caselaw, "Mwangi (Suing as the legal representative of the Estate of Wanjohi Mwangi - Deceased , and on her own behalf) & 2 others v Ngari & 3 others (Land Case E001 of 2025) [2026] KEELC 3985 (KLR)", Case Analysis (2026). Kerugoya ELC No. E001 of 2025. Source: https://new.kenyalaw.org/akn/ke/judgment/keelc/2026/3985/eng@2026-07-01
Suggested citation format for research notes or client memos. Always verify the original judgment before relying on any point.