Mangala v Phabmixay — NSW Supreme Court finds deceased sister’s estate owns half the home

Case
Mangala v Phabmixay
Court
Supreme Court of New South Wales
Judge
Robert Pike (of New South Wales Margaret Beazley AC KC, 2024)
Date Decided
16 October 2026
Citation
[2026] NSWSC 1275
Topics
Constructive trusts, family property, joint endeavour, proprietary estoppel

Background

Cameron Mangala, executor of the estate of his late sister Bouarisone “Sone” Mangala, claimed an interest in a Green Valley property registered solely to another sister, Bouarimone “Mone” Phabmixay, and Mone’s husband, Sthong Phabmixay. Sone had sold her former home in 2002 and directed $182,384.79 of the sale proceeds to Mone. Mone and Sthong used much of that sum to reduce debt on their existing home before borrowing to buy the Green Valley property.

From 2003, Sone made regular monthly payments into the loan account for the property, initially $1,000 and later $1,200. Mone and Sthong maintained that Sone had gifted the sale proceeds and that her payments were rent for their parents. The estate contended that Sone believed she owned the property, or alternatively that she, Mone and Sthong had undertaken a joint purchase.

The Court’s Holding

Pike J upheld the alternative joint-endeavour constructive-trust claim. The evidence showed that Sone contributed her former home’s net equity, while Mone and Sthong borrowed for the purchase, and all sides contributed to the loan. The Court rejected the defendants’ account that the money was a gift and the monthly payments were rent.

The joint endeavour ended when Sone died. As the parties’ respective contributions were approximately equal, it would be unconscionable for Mone and Sthong to retain the entire beneficial ownership. The Court held that one half of the property is held on constructive trust for Sone’s estate, subject to the existing mortgage. It dismissed the proprietary-estoppel-by-acquiescence claim because Sone had not been proved to believe she owned the whole property.

Key Takeaways

  • A family member’s substantial initial contribution and continuing loan payments can establish a joint endeavour despite title being held by others.
  • Tax and tenancy documents did not displace the inference that Sone had a beneficial, rather than sole, interest.
  • With roughly equal contributions, equity supported an equal beneficial division, subject to the mortgage.

Why It Matters

The decision illustrates that Australian courts will examine the substance of long-running family financial arrangements, not merely registered title or labels such as “rent.” Clear evidence of shared funding and a common acquisition purpose can support a constructive trust when the arrangement ends unexpectedly.

The Court directed the parties to attempt to agree consequential orders and costs, with unresolved issues to be determined on the papers.

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