Mirror wills and blended families

Similar wishes do not create a binding promise.

Mirror wills are two separate wills with similar provisions. A common arrangement leaves each person’s estate to the other, with children inheriting after the survivor dies. That may suit a couple whose wishes are straightforward. It needs closer thought when either person has children from an earlier relationship.

The central issue is control after the first death. Ordinary mirror wills generally leave the survivor free to change their own will, spend inherited assets or make gifts. The original intention that everything will eventually pass to particular children is not necessarily protected by the similarity of the documents.

A practical example.

Imagine Alex and Sam each have a child from a previous relationship. Their wills leave everything to each other and then equally to both children. Alex dies first. Sam inherits outright. Several years later, Sam makes a new will leaving everything to Sam’s own child.

Alex’s child may then receive nothing from the assets Alex expected would eventually be shared. The change may be deliberate, or it may happen after a new relationship, financial pressure or advice based only on Sam’s circumstances. The original mirror wills do not generally freeze the survivor’s future choices.

This does not mean mirror wills are inherently unsuitable for blended families. It means that both people need to understand what they achieve and decide whether the flexibility they give the survivor is consistent with their wishes.

Start with the competing needs.

What should the survivor be able to do with the home? Should they be free to move, downsize or release money? What income and savings will they need? At what point should children receive an inheritance, and should they receive it outright or through a trust?

There is rarely one answer that maximises every person’s freedom and protects every beneficiary at the same time. A restriction that protects children’s eventual inheritance may limit the survivor. A gift made outright gives the survivor more control but leaves less certainty about what will remain.

Be clear about who counts as a beneficiary. A stepchild is not automatically treated in the same way as a biological or adopted child under every legal rule. Names, family relationships and any intention to include future children or grandchildren should be discussed and recorded carefully.

Property ownership and trusts.

How you own your home matters. Property held as beneficial joint tenants normally passes to the survivor outside the will. A will cannot redirect that share simply by naming a different beneficiary. Where the property is held as tenants in common, each person’s share can generally pass under their will.

A suitably drafted will trust may allow the survivor to benefit from assets while preserving an interest for other beneficiaries. For example, the survivor might have a right to occupy a property or receive income, with the remaining interest passing to children later.

Trusts have responsibilities, costs and tax consequences. The choice of trustees and their powers matters. They are not a universal answer, and no arrangement should be sold as a guaranteed way to avoid care costs or family claims. Property ownership and trust provisions need to be considered together.

Other documents need to fit.

Check pension nominations, life policies, joint accounts, shareholder agreements and any existing trusts. These may direct assets independently of your will. If you leave someone out who might reasonably expect provision, seek advice about possible claims rather than assuming an explanatory letter settles the issue.

Mutual wills are a different, potentially binding arrangement and should not be confused with ordinary mirror wills. They can restrict what happens after the first death and require specialist advice. The label used by a provider should never replace a clear explanation of the legal effect.

Bring the family picture to the first meeting.

Bring existing wills, information about property ownership, pension nominations and a simple family outline. Explain previous relationships, dependants and any promises already made. If you and your partner want different outcomes, say so early; separate advice may be appropriate where interests conflict.

CCM’s partners help you consider the choices before instructions are drafted. Straightforward mirror wills start from £249 including VAT; trusts and more complex arrangements are quoted separately. Read about making a will or book a free initial consultation. This is general guidance for England and Wales, reviewed on 22 October 2026.