Family law disputes don’t always involve just two people. In financial remedy proceedings following divorce or separation, it is increasingly common for friends, family members or other third parties to become involved, particularly where there are questions about property ownership, loans, or financial contributions. These third parties are known as interveners.

Understanding when and why someone may be brought into family proceedings is essential, not only for separating couples but also for parents or relatives who may have helped financially and now find themselves drawn into a dispute.

What is an Intervener?

An intervener is a person or organisation who is not one of the separating spouses, but who is joined into the court proceedings because their rights or interests are connected to the financial issues the court is being asked to decide.

Most often, interveners appear where there is a disagreement about:

• Who really owns a property
• Whether the money given was a genuine loan or a “soft” family arrangement
• Whether assets are held on trust, or have been placed in someone else’s name unfairly

When Can the Court Add or Remove a Party?

The Family Procedure Rules give the court a wide discretion to add a third party where it is desirable to do so. This may be because:

• The court needs their involvement to resolve all disputes fairly, or
• There is a connected issue between an existing party and a third party that cannot properly be dealt with without them being involved

Importantly, the court can make this decision on its own initiative or following an application from one of the parties, including the third party itself.

Is Joinder Always Necessary?

Not every case involving third‑party claims requires a formal application to join them to proceedings. The court has made it clear that a proportionate approach is required.

Where one spouse is seeking the transfer or sale of a specific asset and another person claims it belongs to them, joinder will often be appropriate so ownership can be determined fairly. However, in cases where a party is simply arguing about the value of the other spouse’s wealth, it may not be necessary or sensible to join every disputed claimant.

Each case turns on its own facts, and early legal advice is crucial.

Who Should Apply to Join a Third Party?

This is often a tactical decision. However, the courts have offered clear guidance:

• If a spouse claims that assets held in their name actually belong to someone else, it is generally their responsibility to apply to join that person
• If it is alleged that a third party is merely holding assets as a nominee, the person making that allegation should bring the application
• If a third party wishes to protect their own position, they can apply directly to intervene

Handled properly, early joinder can reduce costs and bring clarity far earlier in the proceedings.

Property Sales and the Rights of Third Parties

Where a third party has a beneficial interest in a property, the court must allow them to make representations before ordering a sale.

Recent case law confirms that having a beneficial interest does not automatically prevent a sale, even if the property is the third party’s home. The court will carefully balance:

• The size of the third party’s interest
• Whether the property is the family home
• The age, health and housing needs of any third party
• Whether alternative housing options are realistically available

The court’s priority remains fairness overall, particularly where a sale is the only realistic way of achieving a financial settlement between spouses.

How Are Third‑Party Disputes Dealt With in Practice?

Where ownership is disputed, the court will usually direct the parties to set out their positions formally by way of points of claim and defence. These documents explain:

• The legal basis of the claim (for example, a trust or loan)
• What remedy is being sought
• Which facts are agreed upon or disputed

These documents are important. They must be accurate, supported by evidence, and verified by a statement of truth.

There is also an important decision to make about timing: should ownership disputes be resolved before a Financial Dispute Resolution (FDR) hearing, or should the FDR come first? Courts increasingly recognise that, in some families, bringing everyone together earlier may provide an opportunity to resolve matters pragmatically and avoid escalating conflict.

Trusts, TOLATA and Family Proceedings

When a dispute arises over who really owns a property involving a third party, the family court does not apply its usual broad fairness approach. Instead, it must look at the issue through the lens of trust law, just as a civil court would.

This often brings the Trusts of Land and Appointment of Trustees Act 1996 (TOLATA) into play.

Put simply, the court must first work out who owns what before it can decide how property should be dealt with in financial proceedings.

Express Trusts

The starting point is always whether there is an express declaration of trust, often recorded in the property transfer document or a separate written agreement.

If there is a clear declaration setting out ownership shares, the court will usually treat this as decisive. The judge cannot ignore it or adjust it based on what feels fair.

No Written Trust? The Court Looks at Intentions and Conduct

If there is no written trust, the court may consider whether a common intention constructive trust arises. This involves looking at:

• Whether there was a shared understanding about ownership
• Whether one person relied on that understanding
• Whether they acted to their detriment as a result (for example, by contributing money or giving up other opportunities)

The court cannot assume an intention. It must be proven or clearly inferred from the evidence.

In some cases, particularly where a family member has contributed money, the court may also consider whether a resulting trust or proprietary estoppel claim applies. These arguments focus on contributions made, promises given, and whether it would be unfair for those contributions to be ignored.

Family Context Matters – But the Law Still Applies

Recent cases have confirmed that these trust principles apply equally where the third party is a parent or close family member. Even though these arrangements often arise in a family setting rather than a commercial one, the legal tests still apply.

That said, the court will carefully examine the context, including whether the contribution was intended as a gift, a loan, or an investment.

Why This Matters

These issues are highly fact‑specific and emotionally charged, particularly where parents or relatives are involved. Getting it wrong can be costly.

Early advice and clear evidence — such as paperwork, bank records or conveyancing files — can make a crucial difference in resolving disputes efficiently and fairly.

What About Costs?

Unlike most financial remedy proceedings, where each party usually pays their own costs, interveners are treated differently. The court starts from a “clean sheet”, but the general expectation is that costs follow the event, meaning an unsuccessful intervener can be ordered to pay costs.

This makes early advice and careful decision‑making especially important for any third party considering involvement.

How We Can Help

At Ridley & Hall, we regularly advise:

• Clients whose family members have contributed to property purchases
• Parents are concerned about protecting loans or gifts
• Individuals facing intervention applications in ongoing financial proceedings

Our Family team combines technical expertise with a practical, sensitive approach, helping clients navigate what can be a daunting and emotionally complex process.

If you are concerned about third‑party involvement in your case or think you may need advice before matters escalate, we are here to help. Please contact Karen Roberts: karen.roberts@ridleyandhall.co.uk

Partner, Family & Matrimonial