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Trusts & Legacy

Protecting a blended family's legacy

Why mirror wills can leave a first family with nothing, and what tends to be considered instead where two sets of children are involved.

Cromwell Associates editorial team · 6 min read · Reviewed September 2026

Two intentions in one estate

Where a couple has children from earlier relationships, an estate is asked to do two things at once: keep the surviving partner secure, often in the home they share, and make sure the children of the first relationship eventually receive what was meant for them. Those aims are not automatically in conflict, but they pull in different directions on timing — one needs the assets available now, the other needs them preserved for later.

Where that tension is left unresolved in the drafting, difficulties can follow later without anyone having acted badly.

Why mirror wills can disappoint

The common pattern is a pair of wills in which each partner leaves everything to the other, and then, on the second death, to all the children between them. It reads as balanced and it usually reflects genuine intentions.

The difficulty is what happens after the first death. The survivor inherits outright. Being the owner, they may make a new will, remarry, spend the money, help their own children, or be obliged to use the assets to fund care. Ordinary mirror wills do not by themselves create a binding agreement preventing later changes, and whether any obligation exists in a particular family depends on the circumstances and on any arrangements already made — something a specialist needs to check. The children of the first relationship may end up with less than intended, or with nothing.

That is a possible outcome, not an inevitable one — plenty of families are perfectly served by simple mirror wills. The point is that the arrangement depends on the survivor's future decisions, and it is worth deciding knowingly whether you are content with that.

How the home is owned may matter more than the will

Ownership frequently decides the outcome before the will is read. Where a home is held as beneficial joint tenants, it passes to the surviving owner by survivorship whatever the will says. Where it is held as tenants in common, each owner has a distinct share which can be left by will, or into a trust.

For a blended family that distinction is often the whole question, and it is one of the first things a specialist will look at. It is also worth checking pensions and any policies at the same time. Pension death benefits depend on the scheme rules: an expression of wishes may guide the provider or trustees but does not necessarily determine payment, and forms signed years ago sometimes still name a former partner.

What families consider instead

There is no standard answer, and what follows is general information rather than a recommendation. Broadly, the approaches split into three:

  • A will trust giving the survivor rights over a share of the home or the income for their lifetime, with the capital passing to named children afterwards. Whether it achieves that depends on the drafting, how the property is owned, and the family's circumstances.
  • Provision made on the first death directly to the children of that relationship, with the survivor's security met from other assets or from a policy — which requires enough assets, or enough cover, to do both.
  • A discretionary trust, where trustees decide how benefit is applied within the powers the governing terms give them. Flexible, but the extent of those powers depends on those terms, changing or unwinding the arrangement later may be difficult, and it carries its own tax, reporting and registration obligations.

Trustees and executors deserve real thought

In a blended family the choice of trustee is not administrative. Appointing the surviving partner alone, or one side's children alone, puts that person in a position where their own interests and their duties may not point the same way. Trustees must keep to the deed, hold the balance fairly between beneficiaries whose interests compete, keep records, and can be personally liable if they get it wrong.

Many families pair someone who understands the intention with a professional who understands the mechanics, accepting that a professional charges. Whoever is chosen should be told what the role involves before they agree to it, and the deed should say who can appoint and remove trustees over the decades ahead.

Saying it out loud

Where intentions have been explained during someone's lifetime, families at least argue about the plan rather than about what the plan was. A letter of wishes setting out the reasoning — why one child was helped earlier, what should happen to a particular property if it remains sensible — gives trustees the thinking they would otherwise have to guess at.

It is a guide and not an instruction: it does not bind trustees, cannot override the governing terms, and cannot guarantee that nobody will be unhappy or that no claim will be made. What it can do is reduce the guesswork left to the people making the decisions.

A fictional illustration

This example is entirely fictional and nothing in it is a recommendation. Imagine a couple in their fifties, each with two children from an earlier relationship, living in a home they bought together. Three things sit on the table: how that home is legally owned, what the survivor would need in order to go on living there, and what each set of children would eventually receive. No trust is presumed to be the answer — the couple may conclude that straightforward wills suit them, or that ownership is the thing to look at first. The value of setting it out is that the questions get asked before any document is drafted.

Questions worth asking the specialist

Take these to whoever drafts the documents, before anything is signed.

  • How is our home owned, and does that already decide what happens on a first death?
  • Under the wills as they stand, what could my children actually end up with?
  • If a trust is proposed, which type, why that one, and what are the tax and reporting consequences?
  • Who are the trustees, do they know what is involved, and who can replace them?
  • How is the survivor's security provided for, and what happens if they need care or remarry?
  • What does this cost to set up, and what does it cost to run each year?
  • What would make this the wrong arrangement for us?

Where we fit

Cromwell Associates coordinates the enquiry. One named contact records the intention and the family circumstances accurately and introduces you to a specialist who assesses suitability, advises and drafts under their own engagement. We do not draft wills or trusts, give legal or tax advice, or act as trustee.

Please do not send wills, deeds or other sensitive documents through the enquiry form; the specialist will explain how to share them securely.

Sources and further reading

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