Can You Contest a Mirror Will?

Written by Tanya Waterworth, Digital Content Writer

About Our Legal Expert: This content is produced with oversight by Michael Jefferies, Managing Director who has over 30 years’ legal experience.

What Happens If Surviving Step‑Parent Leaves Everything to Their Own Children

If you’ve found yourself unexpectedly cut out of a will after a step-parent has rewritten their will to leave everything to their own children, your next question may well be ‘can you contest a mirror will’. We have seen a rise in contentious probate claims due to the increase in blended families where there are biological and step-children.  Often couples have done mirror wills which leave an estate to all the children. But if a spouse has passed away, the surviving step-mum or dad can legally change their will.

This can be very hurtful for the children who have been left out and essentially a betrayal of the deceased parent’s wishes. So, the question becomes whether you can dispute such a will?

Why This Situation Happens

In many blended families, both partners make “mirror wills”. These are matching wills that leave everything to each other, and then to all their children equally. We have seen that the main problem is that mirror wills are not binding.

Essentially, after the first partner dies, the surviving partner inherits the estate and becomes free to rewrite their will in whichever way they choose, for example:

• Leave everything to their own biological children
• Exclude step‑children
• Change executors
• Redirect assets away from the original family line

Can You Contest the Step‑Parent’s New Will?

Yes, you can potentially contest the will, but only on specific legal grounds. It’s good to be aware of the fact that while the change feels unfair, it is not enough to dispute a will. You must be able to show that the new will is invalid or that you have a legal right to financial provision from the estate.

What Is A Mutual Will?

A better option for spouses is to make mutual wills. These are wills created by both spouses, in which the surviving spouse is legally bound by the original agreement. However, these wills don’t appear to be common, while mirror wills seem to be more well-known.

Basically, a mutual will ensures that the surviving spouse cannot change the distribution of the estate.

 Challenging the Will If a Mirror Will is Changed

If the step‑parent changed their will late in life, or under suspicious circumstances, you may be able to challenge the new will’s validity, for example

1. Lack of testamentary capacity

A will may be invalid if the step‑parent lacked the mental capacity to:

• Understand what they were signing
• Know the extent of their estate
• Have an understanding of who they should reasonably consider as beneficiaries

Medical records, witness statements, and solicitor notes can all help to establish mental capacity.

2. Undue influence

If someone pressured or manipulated the step‑parent into changing their will, the will can be set aside. This is difficult to prove, but signs to watch out for include:

• Sudden changes in the will
• Isolation of the step‑parent
• A beneficiary controlling access to the step‑parent
• A new will that dramatically departs from long‑standing intentions

Claiming Financial Provision Under the Inheritance (Provision for Family and Dependants) Act 1975

If you were financially dependent on your step‑parent, or if your deceased parent intended for you to benefit from the estate, you may be able to claim under the Inheritance Act.

1. Who can claim?

Step‑children can claim if they were treated as a child of the family. This includes situations where:

• Your step‑parent helped raise you
• You lived with them as part of the family unit
• They provided financial support
• They acted in a parental role

You do not need to be legally adopted.

2. What can you claim?

You can ask the court to award you reasonable financial provision from the estate. This does not necessarily mean an equal share, but it can result in a significant award depending on your circumstances.

3. Time limits

You must bring an Inheritance Act claim within six months of probate being granted, so acting quickly is essential.

 Challenging the Will Based on a Broken Promise (Proprietary Estoppel)

If your parent or step‑parent made a clear promise that you would inherit something and you relied on that promise, you may be able to claim under proprietary estoppel.

Here are some examples where you may have:

• Worked in a family business for low pay because you were told you’d inherit it
• Invested time or money into maintaining a property you were promised
• Made life decisions based on assurances about inheritance

If the promise was clear and you relied on it, the court can enforce the promise even if the will says otherwise.

 Investigating Whether the Step‑Parent Inherited Everything Properly

Sometimes the issue is not the step‑parent’s new will at all, but how they inherited the estate in the first place. You may be able to challenge the earlier estate administration.

For example:

• Your parent may have died intestate, leaving everything to the spouse
• Assets may have been transferred incorrectly
• A trust may have been intended but never created

It may be worth checking if the original estate was mishandled as you may have a claim against the executors or administrators.

 What You Should Do Immediately

If you believe the step‑parent’s new will is unfair or invalid after you relied on mirror wills, you should take the following steps:

Get a copy of the will

You can obtain the will once probate is granted. If probate has not yet been granted, a solicitor can help you monitor the application.

Gather evidence

In the meanwhile, start collecting evidence which may be relevant, such as:

• Old wills
• Emails or letters showing your parent’s intentions
• Witness statements
• Medical records
• Financial records showing dependency

Get specialist legal advice early

Contentious will disputes are complex, and early advice can determine the strength of your case and how to move forward.

Our panel of contentious probate solicitors offer a range of fee structures, including ‘No Win, No Fee’ for certain cases along with other flexible funding.

Consider entering a caveat

A caveat stops probate from being granted and gives you time to investigate. This is useful if you suspect the will is invalid. This is because once probate is granted, assets may be distributed which become difficult to recover.

Your Next Step

If you’ve just found out that a step-parent has left everything in favour of their own children, it  can feel deeply unjust. This is especially the case when it contradicts everything your parent intended.

So, act quickly, gather evidence, and get in contact with our team as you may have a valid contentious probate claim.

We partner with highly experienced lawyers in this field and we will give you the support and understanding you need at this difficult time. Call us at 0330 818 0348 or visit our Contact Us Page.