Buying a home with family help: what happens if things go wrong?

It is increasingly common for parents or other family members to help adult children buy or improve a home. This support can take many forms: contributing to a deposit, funding renovations, building a granny annexe, or even selling a parent’s own home to move in together.

While these arrangements often start with the best intentions, problems can arise – for example, if the adult child and their spouse divorce. At that point, difficult questions may emerge, such as:

• Was the money a gift?
• Was it a loan that should be repaid?
• Was it an investment, giving the parent a share in the property?

Where there is a dispute, the family member may need to become an intervenor in the divorce proceedings to protect their position.

What Is an intervenor?

An intervenor is a third party – often a parent – who becomes involved in divorce proceedings because they claim they have a financial interest in a property or asset owned by the separating couple. This most commonly happens where:

• a parent has contributed a significant sum towards buying the home
• a parent has paid for an extension or annexe and lives (or expected to live) there.

The court then has to decide what was intended at the time the money was given and what outcome would be fair.

Gift or loan: why the difference matters

One of the most frequent disputes is whether money given by a parent was a gift or a loan.

If the money was a gift, it usually becomes part of the couple’s shared assets and is divided between them on divorce. If it was a loan, the court must decide whether it is a hard loan (one that is likely to be repaid, similar to a bank loan) or a soft loan (an informal family arrangement that may never realistically be enforced).

Family loans are often treated as ‘soft’ where there is no written agreement, no repayment timetable, and no attempt to ask for the money back during the relationship. In those cases, the court may decide not to treat the loan as something that must be repaid before the couple’s assets are divided.

Does paying money create a share in the home?

Not automatically. To establish a share in the property, a parent usually needs to show one of the following:

• a clear shared understanding that they would have an interest in the property
• that they relied on a promise or assurance (for example, being told they would have a “home for life”) and acted to their detriment.

This is particularly relevant where parents fund the construction of a granny annexe; or

sell their own home to move in with the family.

The courts do not usually aim to reimburse every pound spent. Instead, they look at what is fair. This might mean awarding a percentage of the property’s value rather than full repayment of all contributions.

Granny annexes and ‘home for life’ promises

This occurs where a parent has sold their own home, paid for an annexe or major renovations, and done so following assurances that they could live there permanently. The court may find that it would be unfair for the couple to keep the benefit of that investment without recognising the parent’s interest.

In recent cases, courts have awarded parents both a right to live in the annexe and a percentage share of the property reflecting how much value their contribution added.

However, it is important to remember that even in these situations, outcomes are highly fact‑specific and depend heavily on evidence.

Equity of exoneration

In an intervenor’s claim, the principle of equity of exoneration arises where a third party (the intervenor) holds a beneficial interest in property that has been charged to secure the debts of another. This commonly occurs in matrimonial contexts, for example where spouses undergoing divorce proceedings have granted a charge over the family home to secure borrowing undertaken by one party or where both spouses have a normal domestic mortgage.

Where property is owned jointly (or beneficially shared), but a charge or mortgage has been imposed to secure a debt incurred solely for the benefit of one co-owner, equity presumes that the borrowing party is responsible for that debt as between the co-owners. Accordingly, the intervenor is entitled to be exonerated, such that their beneficial interest should not bear the burden of the indebtedness.

In practical terms, this means that the intervenor may contend that their interest should be calculated by reference to the gross value of the property, rather than the net proceeds of sale after discharge of the secured liability. The effect is to shift the economic burden of the debt onto the borrower’s share of the equity.

The presumption of exoneration is rebuttable and may be displaced by evidence of a contrary intention – such as an agreement or understanding that the debt was to be shared, or that both parties were to benefit from the borrowing.

Its successful application depends on the intervenor demonstrating:

– the existence of a beneficial interest in the property

– that the loan or secured obligation was incurred solely for the benefit of the other co-owner.

In this context, equity of exoneration operates as a defensive equitable doctrine, enabling the intervenor to protect their beneficial share by reallocating the burden of the secured debt to the party who incurred it.

Do parents always need to be joined to the divorce?

Not always. Sometimes the court can resolve disputes by hearing parents as witnesses without formally involving them as parties. However, joining a parent as an intervenor may be necessary where a property share is claimed.

Intervenor claims can increase legal costs, so careful thought should be given before proceeding.

Practical lessons for families

1. Put it in writing: A simple written agreement setting out whether money is a gift, a loan, or an investment can prevent years of dispute.
2. Don’t rely on assumptions: Family members may remember conversations very differently years later.
3. Keep records: Bank statements, emails, messages, and conveyancing paperwork are often critical.
4. Fairness matters more than reimbursement: Courts focus on what is fair, not necessarily on repaying everything spent.
5. Get advice early: Both couples and parents should consider legal advice before making large financial commitments.

Family help can make home ownership possible, but without clear agreements it can also create serious difficulties if relationships break down. Intervenor claims are complex, emotionally charged, and heavily dependent on evidence. With careful planning and early advice, many disputes can be avoided altogether.

If you are considering helping a child buy or improve a property – or if you are already facing a dispute – we recommend taking advice as early as possible to protect everyone involved.