Appointing a Guardian in Your Will

How to appoint a legal guardian for your children in your will, when the appointment takes effect, and what to consider.

Reviewed by the Estate Advisory Group editorial teamLegally reviewed: 13 August 2026Last updated: 13 August 2026

In short

  • A guardian appointed in your will only takes on parental responsibility in certain circumstances
  • If the other parent is alive and has parental responsibility, they usually remain the surviving guardian
  • Choose someone willing and able to take on the role, and always ask them first
  • Unmarried fathers without parental responsibility should check their legal position

One of the most important things a will can do for a parent is appoint a guardian: someone who will have parental responsibility for your children if you die while they are still under 18. This is a legal appointment made under section 5 of the Children Act 1989, and it is one of the clearest reasons parents of young children make a will even when their finances are modest.

This guide explains how to appoint a guardian, when the appointment actually takes effect, and the practical and family considerations involved in choosing the right person. It applies to England and Wales.

What a testamentary guardian appointment does

Appointing a guardian in your will is a legal step under section 5 of the Children Act 1989. It names the person or people you want to take on parental responsibility for your children if you die. Married parents and mothers automatically have parental responsibility; fathers who were not married to the mother at the birth may not have it automatically, though it can be acquired in several ways, including being named on the birth certificate since December 2003.

It is important to understand that this is different from simply naming someone as a favourite relative in conversation. The appointment needs to be made in the will (or in a separate signed and dated document) to have legal effect, and it should name the guardian clearly.

When does the appointment actually take effect

A common misunderstanding is that appointing a guardian in your will means they take over the moment you die. In fact, if the other parent is still alive and has parental responsibility, they normally continue to have parental responsibility and your appointed guardian does not usually take effect immediately.

Broadly, a guardian you appoint takes effect where there is no one else with parental responsibility for the child (for example, if you are a single parent, or if both parents have died), or where you had a child arrangements order in force immediately before your death naming you as the parent the child was to live with. This is a simplified summary of a legally technical area, and if your family situation is unusual it is worth checking your specific position.

Choosing the right guardian

There is no perfect candidate, but useful questions include whether the person shares your values and approach to bringing up children, whether they are willing and realistically able to take on the responsibility, and whether their own life stage and circumstances make it practical, for example their age, health and existing family commitments.

Always ask the person before naming them. It is also sensible to name a reserve guardian in case your first choice is unable or unwilling to act when the time comes, and to talk to your children's other parent so you agree an approach together where possible.

  • Do they share your outlook on raising your children?
  • Are they able and willing, given their own circumstances?
  • Have you spoken to them, and do they agree?
  • Have you named a reserve in case they cannot act?

Guardianship and money are separate questions

Appointing a guardian deals with who looks after your children day to day. It does not automatically mean that person controls any money you leave for the children. That is usually managed separately by the executors or trustees of your will, who may or may not be the same people as the guardian.

Some parents deliberately separate the two roles, for example appointing a sibling as guardian but a different, more financially experienced person as trustee, so that money matters and day-to-day care are not concentrated in one person.

When to take further advice

If you are an unmarried father without parental responsibility, if there is a dispute or difficult relationship with the other parent, or if a child has additional needs that mean guardianship arrangements need to be more carefully structured, it is worth speaking to a solicitor to check the appointment will work as intended.

For most families, a straightforward guardian appointment made as part of a will is enough to give real peace of mind and to make clear who you want to step in if the worst happens.

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This guidance covers the law of England and Wales and is general information, not legal advice about your circumstances. The rules in Scotland and Northern Ireland differ.