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Citation: Demelza & Arlie [2026] FedCFamC2F 1175

"We Own Half" Isn't Enough: Why a Wife Couldn't Join Her In-Laws to Claim a Trust Over Their Home

In Demelza & Arlie [2026] FedCFamC2F 1175, the Court dealt with a wife’s application to join her former husband’s parents to her property case, so that she could seek a declaration under s 78 of the Family Law Act 1975 (Cth) that the husband held a beneficial interest in the home registered in the parents’ names, by way of a constructive trust or, alternatively, a resulting trust. The result: the joinder application was dismissed, the wife’s points of claim were struck out, the husband’s application for security for costs was formally dismissed, and the costs of the joinder application will be decided on written submissions (Orders 1–6; [81], [83]–[84]). The important point is that joining third parties requires an arguable case built on facts that, if proved, would support the relief sought ([37]–[41]). The husband’s statements to the wife that “we own half” and that he had contributed $400,000 were not evidence of what his parents intended, and the objective documents showed the home was bought with a loan and the parents’ savings, not with a $400,000 contribution from him ([73], [79]–[80]). All paragraph references below are to the judgment.

Why it matters: Many couples live in a property owned by one spouse’s parents, and many spouses are told it is “partly ours”. This judgment shows that, when a marriage ends, those words alone will not bring the parents into the case. To join the legal owners, the claimant needs evidence of the owners’ own intention or of an actual contribution to the purchase, not just what their spouse said. And a planned bequest in a will is not the same as a present share in the house: here, the husband’s talk of “$400,000 equity” was potentially explicable by his understanding of a bequest in his parents’ will ([67], [73(d)]).

🧩 Facts and Issues

The parties and the proceedings

This is an interlocutory decision in property proceedings that the wife started on 3 April 2025, after a marriage of seven years ([1], [20]). The judgment is published under a pseudonym with approval under s 114Q(2) (cover notes).
The parties met in 2015. The wife says they began living together in 2015, and the husband’s father says it was 2016 ([10]–[11]). They married in 2017, separated finally in January 2023 and divorced in 2024 ([12], [16]).
Neither party is in paid employment ([8]).
The husband’s mother, Mrs B Arlie, was appointed by consent as his litigation guardian on 23 July 2025 ([3], [23]). The husband did not file an affidavit for this application because of his incapacity ([31]).

The two properties

The Suburb E property. The husband bought this property in late 2009 and it was sold in late 2015. According to his father, the parents helped buy it and paid the mortgage and expenses, and the husband put the net sale proceeds into a term deposit and used them for his own expenses ([9]).
The Suburb J property. In early 2018, the husband’s parents bought this property as joint tenants for $1,625,000 ([13]). The father deposed that they borrowed $1.5 million from K Finance, secured against their former home, and used savings ([13]).
The Suburb J property has two living spaces connected by a door. The parents have lived there since the purchase. Around July 2018, the parties and the wife’s daughter moved into the other living space ([14]).
The parties moved out in January 2022. Since separation, the husband has moved back into the Suburb J property ([15]–[16]).

The joinder application

On 4 June 2025, the wife filed an amended application seeking, among other things, a declaration that the husband has a 50% equitable interest in the Suburb J property ([22]).
She filed “points of claim” on 25 November 2025 ([24]), and on 2 December 2025 applied to join the husband’s parents as parties and to remove Mrs B Arlie as litigation guardian ([25]).
The husband and his parents opposed joinder, saying the husband has no legal or equitable interest in the property ([4]).
At the hearing on 5 June 2026, it was agreed that if Mrs B Arlie were joined, it would not be proper for her to continue as litigation guardian. The wife did not object to her acting in both roles for the purpose of this interlocutory hearing ([34]–[35]). There was no cross-examination. The Court heard submissions ([36]).

Issue

Did the wife have an arguable case that the husband’s parents would be affected by the final decision, so that their participation was necessary to determine the issues in dispute ([51])?

⚖️ Applicable Law – Legislation, Regulations, Rules

Federal Circuit and Family Court of Australia (Family Law) Rules 2021 (Cth), r 3.01: a necessary party must be joined if two things are satisfied. First, the person’s rights will be directly affected by the proceedings. Second, their participation is necessary to determine all issues in dispute ([37]).
Family Law Act 1975 (Cth), s 78: the power to declare the title or rights a party has in property. The wife sought a s 78 declaration which, if made, would affect the parents’ interest in the Suburb J property, even though she sought no specific orders against them ([2]).
The overarching purpose: the judge also had regard to the overarching purpose, in particular the efficient use of judicial and administrative resources, timely disposal of proceedings and proportionate costs ([82]).
Other provisions listed on the cover page: r 3.03 of the Rules and s 102QAB of the Act are listed, but the reasons do not discuss them.
Family Law Act 1975 (Cth), Part XIVB and s 114Q(2): the publication restrictions and the approval of the pseudonym (cover notes).

📌 Precedents Relied On

Filipovic & Filipovic (No 2) [2023] FedCFamC2F 825: the applicant for joinder bears the burden of showing the proposed party’s participation is necessary ([38]). The wife relied on it at [89] for the proposition that the case need only be “sufficiently arguable to withstand a summary dismissal application”, with her evidence taken at its highest unless inherently contradictory or implausible ([42]).
Rigby & Kingston [2020] FamCA 8 and B Pty Ltd and Ors & K and Anor [2008] FamCAFC 113: sufficient facts must be asserted to establish, if proved, a legal basis for the relief sought ([39]).
Riemann & Riemann and Ors (No. 3) [2017] FamCA 911, citing Hancock Family Memorial Foundation Ltd v Fieldhouse (No 3) [2010] WASC 223: the applicant must show an arguable case sufficient to resist summary judgment by the proposed party. Joining someone who would immediately win summary judgment would be futile ([40]).
Knepp & Ruff [2025] FedCFamC1F 675: bare assertions without particulars are not enough, and “a mere assertion does not ground an arguable case” ([41], [79]).
Muschinski v Dodds (1985) 160 CLR 583 and Baumgartner v Baumgartner (1987) 164 CLR 137: a constructive trust may arise from a common intention to create a beneficial interest, or where it would be unconscionable for the legal owner to deny another’s beneficial interest ([52]).
Deves & Deves [2022] FedCFamC1F 55, summarising Khalif & Khalif [2021] FamCAFC 123: the four requirements for a common intention constructive trust ([53]). Also, a constructive trust “cannot be based on vague principles of fairness or redistributive justice” ([72]).
Giumelli & Giumelli (1999) 196 CLR 101, as summarised in Deves: the five elements of equitable estoppel ([55]).
Abano & Abano [2024] FedCFamC1F 331: a wife’s application to join the husband’s father. Harper J explained that a trust cannot be forced on an unwilling beneficiary, so a claim that relies on the husband’s interest must deal with whether he would accept it ([54]). Also cited on timely disposal and proportionate costs ([82]).
Calverley v Green (1984) 155 CLR 242: a resulting trust arises where a person pays the purchase price and has the property transferred to another, or where two or more people advance the price in different shares ([75]).
Whisprun Pty Ltd v Dixon (2003) 200 ALR 447: the Court need not mention every aspect of the evidence or every argument ([33]).

🧠 Analysis

Issue

The wife wanted to bring her former in-laws into the case so she could claim the husband had a hidden beneficial share of their home. Did she show an arguable case that he did, either through a constructive trust or a resulting trust?

Rule

Joinder of a necessary party. The person’s rights must be directly affected, and their participation must be necessary to determine all the issues ([37]).
Burden and threshold. The applicant bears the burden ([38]). The facts asserted must, if proved, establish a legal basis for the relief ([39]). The case must be arguable enough to survive a summary judgment application by the proposed party ([40]). A mere assertion is not enough ([41]).
Constructive trust. The requirements are a common intention about beneficial ownership, detriment by the claimant, and that it would be a fraud or unconscionable for the other party to deny the interest ([52]–[53]). For an estoppel-based claim, a clear representation, reasonable reliance, material detriment and unconscionability are needed ([55]).
Resulting trust. A resulting trust arises where someone pays all or part of the purchase price ([75]).

Application

The husband had not shown he would accept the alleged trust

There was no direct evidence that the husband assented to being a beneficiary of the alleged trust. He had asked for the wife’s property application to be dismissed with costs, and (through his litigation guardian) for this application to be dismissed with costs ([69]). The judge said this was “unsurprising”, given the proceedings and Mrs B Arlie’s dual role as litigation guardian and proposed respondent ([70]).

The judge did not rest the decision on this point. Even assuming the husband would assent, the wife still did not have reasonable prospects of success ([71]).

What the husband told the wife was not evidence of what his parents intended

At its highest, the wife’s evidence showed that the parents intended the couple to live in their home, and that the husband told her he had an interest in it ([73]). That was not enough for a constructive trust ([73(a)]–[73(f)]):

No common intention. There was no evidence that the husband and his parents formed a common intention about beneficial ownership. The wife relied mainly on what the husband told her, not on anything the parents said ([73(a)], [73(e)]).
“A joint home” is about living there, not owning it. The wife’s “somewhat vague” evidence about family conversations on buying the property as a “joint home” showed the parents intended the couple to live there. It did not show their intention about the husband’s beneficial interest ([73(b)]).
No conduct by the parents. There was no evidence of conduct by the parents from which a common intention could be inferred ([73(f)]).

The parents’ own evidence was that they never told the couple they had an interest. As the father put it: “If we intended [Mr Arlie] to have an interest in the property we would have put his name on the title” ([67]).

The wife’s own documents undercut her claim

The wife tendered two documents ([62]–[64]):

An email from the husband, dated 21 December 2021, listing “$400,000 equity in [H Street] (property owned in my parents name on title records)” ([62]).
A letter to Legal Aid Queensland, dated 2 January 2022, which the wife said the husband wrote for her. It referred to a financial interest of “approximately $400,000”, but went on to describe that interest as “an informal agreement - more like a future inheritance or superannuation” and said “to call it equity is not an accurate description” ([64]).

The judge held that the correspondence was not evidence of a common understanding, and noted that the letter described the interest as “more like a future inheritance or superannuation” ([73(a)]).

The “$400,000 equity” may have been a lay understanding of a bequest

The father’s evidence was that, under the parents’ will, the husband “may receive a bequest of $400,000”, to help him buy a property after their death, and that the husband and his siblings knew about this and agreed to it ([67]). The judge found the husband’s statements about having “$400,000 equity” were “potentially explicable” by his lay, subjective understanding of that bequest ([73(d)]).

The objective documents showed no $400,000 contribution

The father’s account of the purchase was supported by documents ([68]):

A settlement adjustment sheet recording the $1,625,000 price and a $121,875 deposit.
A bank statement showing a $100,000 transfer from the father’s pension account on 3 April 2018, which formed part of the deposit.
An email confirming the later sale of the parents’ former home, including repayment of the loan secured against it ($1,502,606.97).

The judge found that the evidence did not show a $400,000 contribution by the husband. Indeed, “the available objective evidence demonstrated that he did not make this contribution” ([73(c)]).

Free housing is not detriment

The wife claimed the couple relied on the husband’s interest when making decisions about the property. The judge found her evidence did not show detriment ([73(g)]):

The husband’s “significant labour” on renovations, and the wife’s “small household repairs” and purchases of items such as “storage solutions” and “furniture pieces”, were not evidence of material disadvantage, given the couple had free housing.
The wife agreed they lived there without paying rent or contributing to utilities.
There was no evidence the couple were induced to live there or suffered any detriment from living there.

The judge was not persuaded the wife had an arguable case for a constructive trust ([74]).

The resulting trust claim was a bare assertion against the documents

The alternative resulting trust claim depended on the husband having paid $400,000 towards the price ([76]). For this application, the judge proceeded on the basis that the wife’s evidence that the husband told her he contributed $400,000 would be accepted ([78]). But that still did not get her there ([79]–[80]):

Her only evidence was her “bare assertion” that he told her he paid it from the Suburb E sale proceeds. A “mere assertion does not ground an arguable case” ([79]).
There were no further particulars or evidence of the payment ([80]).
Uncertainty about how the husband spent the Suburb E sale proceeds did not support an inference that the money went into the Suburb J property ([80]).
The objective evidence showed the property was bought with a loan and $125,000 in savings, not $400,000 from the husband ([80]).

Proportionality also pointed against joinder

The judge concluded that, without an arguable case about the husband’s interest, the s 78 declaration was not a sufficient basis to join the parents. The application was dismissed and the points of claim were struck out “as disclosing no legal basis for joinder” ([81]). The judge also had regard to the overarching purpose, including the efficient use of judicial resources, timely disposal and proportionate costs ([82]).

Costs and what happens next

The husband’s application for security for costs (for his parents’ costs) was not pressed once joinder was refused, so it was formally dismissed ([83]; Order 3).
The husband sought costs of the joinder application. The judge ordered short written submissions, so that question is still to be decided ([84]; Orders 4–6).
The case was listed for a directions hearing before a Judicial Registrar on 8 September 2026 ([85]; Note A).

Conclusion

The wife did not have an arguable case that the husband held an equitable interest in his parents’ home:

Constructive trust: there was no evidence of a common intention involving the parents, no evidence of conduct by them, no proven $400,000 contribution, and no detriment, given the couple lived there rent-free ([73]–[74]).
Resulting trust: the only evidence of payment was the husband’s reported statement, and the documents showed the purchase was funded by a loan and the parents’ savings ([79]–[80]).
Joinder: without an arguable case, the s 78 declaration could not justify joining the parents. The application was dismissed and the points of claim were struck out ([81]).

The decision is limited to joinder. The wife’s property case against the husband continues ([85]), and the costs of the joinder application are still to be decided ([84]).

🧠 Take-Home Lesson

Joining third parties takes an arguable case, not just a claim. The facts you assert must, if proved, give a legal basis for relief against the people you want to join ([37]–[41]).
What your spouse told you is not evidence of what the legal owners intended. A common intention constructive trust needs evidence of the owners’ own words or conduct ([73(a)], [73(e)]–[73(f)]).
Follow the money with documents. Settlement sheets, loan records and bank statements beat recollections of what someone said ([68], [73(c)], [80]).
Gaps in the other side’s money story do not prove yours. Uncertainty about where sale proceeds went does not mean they went into the property you are claiming ([80]).
The documents you rely on will be read as a whole. The letter the wife relied on also described the interest as “more like a future inheritance or superannuation” ([64], [73(a)]).
Living rent-free cuts against detriment. Labour, small repairs and furniture purchases did not show material disadvantage where the couple had free housing ([73(g)]).
A family promise of a future bequest is not the same as owning part of the house now. The husband’s “$400,000 equity” statements were “potentially explicable” by his understanding of a $400,000 bequest in his parents’ will ([67], [73(d)]).
Practitioners: a trust claim that relies on the other spouse’s beneficial interest must deal with whether that spouse would accept it ([54], [69]–[71]). Also prepare for costs. Here the husband sought costs of the failed joinder application ([84]).
Support workers and McKenzie friends: help clients gather the paper trail before making claims against in-laws’ property. Without it, the claim may be struck out at the threshold ([81]).

“‘We own half’ is not evidence of what the people on the title intended.”

“Follow the money with documents, not with what you were told.”

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