Sibling changed parents will? Find out whether a brother or sister can secretly change a parent’s will, what makes a will valid, and how to challenge a suspicious will in England and Wales
Can a sibling secretly change a parent’s will?
No — a brother or sister cannot simply change your parent’s will themselves and make those changes legally binding. A will belongs to the person who made it, known as the testator. Only that person can normally make or approve changes to their will.
However, a situation where a sibling changed parents will can be more complicated if your brother or sister persuaded, pressured, manipulated or coerced your parent into making a new will or codicil.
In England and Wales, a valid will must be made voluntarily, by someone who has testamentary capacity, and must be properly signed and witnessed.
So, if you discover that your parent’s will has suddenly changed and your sibling benefits from the new version, the important question is not simply whether your sibling was involved. The key question is how the change happened and whether your parent genuinely intended it.
This article explains what you can do if you believe a sibling changed parents will, including when a will can be challenged, what evidence may help and what steps you can take before probate is granted.
What does it mean if a sibling changed parents will?
There are several very different situations that families sometimes describe as a sibling changed parents will.
For example:
- Your sibling physically altered the original document.
- Your sibling arranged for your parent to make a completely new will.
- Your sibling encouraged your parent to leave them more money or property.
- Your sibling took your parent to a solicitor without telling other family members.
- Your sibling was present when your parent gave instructions for a new will.
- Your parent was elderly, seriously ill or dependent on your sibling when the will changed.
- Your sibling may have concealed an earlier will.
- Your sibling may have pressured your parent into signing something they did not genuinely want.
These circumstances are not automatically enough to invalidate a will.
Parents are generally free to decide how their property should be distributed. A child does not automatically have a right to receive an equal share of a parent’s estate.
The concern arises when there is evidence that the will does not represent your parent’s genuine wishes or was not legally valid.
Can my brother or sister change my parent’s will without permission?
No.
A sibling cannot legally take your parent’s signed will and simply rewrite the beneficiaries, cross out clauses or add new instructions.
The law provides specific requirements for changing or revoking a will. GOV.UK explains that once a will has been signed and witnessed, it cannot simply be amended; changes generally need to be made through a properly executed codicil or a new will.
The Wills Act 1837 also sets out rules concerning revocation and alterations to wills.
Therefore, if someone literally writes on an existing will without following the required legal formalities, that alteration will not necessarily be legally effective.
The situation is different if your sibling helped your parent make a new will.
A new will can replace an earlier will if it has been properly made and represents your parent’s genuine wishes.
That is why proving that a sibling changed parents will requires looking at the circumstances surrounding the new will rather than simply comparing two documents.
What if my sibling persuaded my parent to make a new will?
Persuasion is not automatically illegal.
Your parent can change their mind about their estate. They can decide to leave more to one child, less to another child, or even leave a child out completely.
The important distinction is between persuasion and undue influence.
Undue influence may arise where someone exerts improper pressure on the person making the will so that the resulting document does not represent their genuine independent wishes.
The Law Commission has highlighted concerns about the difficulty of challenging wills based on undue influence, particularly because coercion can happen privately and may involve someone close to the person making the will.
For example, concerns may arise where:
An elderly parent suddenly changes their will shortly before death, leaving most of their estate to the child who controlled their finances, while other family members had previously been expected to inherit.
That does not automatically prove undue influence.
However, circumstances such as dependency, isolation, pressure, threats or unusual changes may justify investigating what happened.
What if a sibling physically altered the original will?
This can be particularly serious.
A will is not something another beneficiary can simply edit after it has been executed.
GOV.UK states that changes to a will must follow the appropriate signing and witnessing requirements.
The Wills Act 1837 also provides rules concerning alterations and revocation.
If you believe your sibling physically altered the document, preserve evidence rather than attempting to repair, rewrite or destroy it yourself.
Useful evidence might include:
- The original will.
- A copy of an earlier will.
- Photographs of the document.
- Solicitor correspondence.
- Emails or letters.
- Medical records where relevant to capacity.
- Evidence concerning who had possession of the will.
- Statements from witnesses.
- Evidence of suspicious handwriting or alterations.
Do not make further marks on the document.
Can a sibling make a new will on behalf of a parent?
Generally, a sibling cannot simply make a will for your parent.
A will expresses the wishes of the person whose estate will eventually be distributed. The person making the will must meet the legal requirements for validity.
GOV.UK states that a valid will must be made voluntarily and that the person making it must be of sound mind. It must also be in writing, signed in the presence of two witnesses, with the required witnessing process followed.
A sibling can help a parent arrange an appointment with a solicitor. They may even provide practical assistance.
But that does not mean the sibling should dictate the contents of the will.
If the evidence suggests that the sibling controlled what was said, prevented the parent from expressing their own wishes or exerted improper pressure, this could become relevant to a challenge.
What if my parent wanted to change the will but my sibling helped?
This is one of the most important distinctions.
Suppose your parent genuinely wanted to change their will.
Your sibling:
- drove them to the solicitor;
- helped arrange the appointment;
- waited outside;
- helped with practical arrangements; or
- reminded them to update their will.
Those facts alone do not necessarily invalidate the will.
Your sibling’s involvement becomes more concerning if there is evidence that your parent:
- did not understand the changes;
- was pressured into making them;
- was threatened;
- was isolated from other family members;
- was dependent on the sibling;
- did not actually give the instructions recorded in the will;
- lacked testamentary capacity; or
- was prevented from making an independent decision.
The central issue is therefore whether the will reflects your parent’s genuine and legally valid decision.
What is testamentary capacity?
Testamentary capacity concerns whether someone was mentally capable of making a valid will.
A person may be elderly, physically ill or have a medical condition without automatically lacking testamentary capacity.
The question is whether they had the necessary understanding when the will was made.
This can become particularly important where a sibling changed parents will shortly before the parent died or during a period of significant cognitive decline.
Evidence could include:
- medical records;
- GP records;
- hospital records;
- care-home records;
- solicitor attendance notes;
- previous wills;
- correspondence;
- witness evidence; and
- evidence about the parent’s behaviour around the time the will was signed.
A sudden change does not itself establish lack of capacity.
However, a significant change combined with evidence that your parent did not understand what they were signing may warrant further investigation.
Does being left out of a parent’s will prove that my sibling changed it?
No.
Being excluded from a will can be extremely upsetting, but it does not automatically mean that the will was changed unlawfully.
Parents generally have considerable freedom to decide who receives their estate.
For example, your parent might legitimately decide to leave:
- their house to one child;
- savings to another child;
- a specific gift to a grandchild; or
- their estate to someone outside the immediate family.
A challenge usually needs a legal basis.
If you believe a sibling changed parents will, ask:
- Was the will properly executed?
- Did your parent understand the will?
- Did your parent genuinely intend the changes?
- Was there pressure or coercion?
- Was your parent vulnerable or dependent on the sibling?
- Was the new will radically different from previous wishes?
- Was the sibling involved in arranging or supervising the will?
- Is there independent evidence explaining the change?
- Is there evidence that the document was altered or forged?
- Has probate already been granted?
These questions can help establish whether there is a genuine legal issue rather than simply a family disagreement.
What evidence can prove a sibling changed parents will?
Evidence is particularly important in will disputes because allegations can be difficult to establish without supporting documentation.
If you suspect your sibling changed parents will, look for evidence concerning both the will itself and the circumstances in which it was created.
1. Earlier versions of the will
Compare the new will with previous versions.
A dramatic change can be relevant, particularly if it appears inconsistent with your parent’s long-established wishes.
However, a change is not automatically suspicious. People are entitled to change their minds.
2. Solicitor’s file
The solicitor who prepared the will may have attendance notes, letters, emails and records explaining how instructions were received.
These documents can be extremely useful in understanding whether your parent gave independent instructions.
3. Medical evidence
Where capacity is disputed, medical records may help establish your parent’s condition around the date the will was made.
4. Witness evidence
The witnesses who signed the will may be able to explain what happened when the document was executed.
5. Communications
Emails, text messages, letters and other communications may reveal discussions about the estate or pressure being placed on your parent.
6. Financial evidence
Bank statements and financial records may sometimes reveal wider circumstances involving dependency, control or unusual transactions.
7. Evidence about your parent’s wishes
Earlier statements, correspondence or previous wills may help establish what your parent had previously intended.
What are the grounds for challenging a suspicious will?
A will may potentially be challenged on different grounds depending on the circumstances.
These can include arguments concerning:
Lack of testamentary capacity
The person making the will may not have had the required mental capacity when the will was made.
Undue influence
The will may have resulted from improper pressure or coercion rather than the person’s genuine wishes.
Lack of knowledge and approval
The person may not have understood or approved the contents of the will.
This can be particularly relevant where the document was complicated, unusual or inconsistent with the person’s circumstances.
Improper execution
The will may not have been signed and witnessed according to the legal requirements.
GOV.UK sets out the requirements for making a legally valid will, including the signing and witnessing process.
Fraud or forgery
If the document itself is fraudulent or a signature has been forged, this can raise serious validity issues.
Revocation
A later valid will may revoke an earlier one. GOV.UK explains that a new will should normally state that previous wills and codicils are revoked.
The correct legal route depends on the evidence and circumstances.
What should I do if I think my sibling changed my parent’s will?
If you have serious concerns, avoid confronting your sibling before understanding the position.
Instead, consider taking the following steps.
Step 1: Find out which will is being relied upon
Try to establish the date of the will and whether there were earlier versions.
If probate has already been issued, you may be able to search probate records and order a copy of the will through the GOV.UK probate records service.
Step 2: Preserve evidence
Keep copies of relevant:
- wills;
- letters;
- emails;
- messages;
- medical evidence;
- solicitor correspondence; and
- financial records.
Do not alter original documents.
Step 3: Establish whether probate has been granted
This is important because different options may be available before and after a grant of probate.
Step 4: Consider a caveat
If probate has not yet been granted and there is a genuine dispute about the validity of the will, a caveat may be available.
GOV.UK explains that entering a caveat can stop a grant of probate being issued while the dispute is addressed. A caveat initially lasts for six months and can be extended.
However, a caveat can lead to legal proceedings and costs, so it should not be used simply as a way of delaying an estate.
Step 5: Obtain specialist legal advice
Will disputes can become complicated quickly, particularly where allegations of undue influence, fraud or lack of capacity are involved.
A solicitor can assess the evidence and explain whether there is a realistic basis for challenging the will.
Can I stop my sibling from getting probate?
Potentially, if there is a genuine dispute about the will and probate has not yet been granted.
A caveat is one mechanism that may be used to stop a grant from being issued while a dispute is considered.
GOV.UK specifically states that someone can challenge another person’s probate application by entering a caveat where there is a dispute about issues such as whether a will exists or whether the will is legal.
The caveat process should not be treated as a way to automatically invalidate a will.
It is better understood as a way of preventing the grant from being issued while the underlying dispute is addressed.
What happens if probate has already been granted?
The position can become more complicated once probate has been granted.
If you believe the grant or will is invalid, legal proceedings may be necessary.
HM Courts & Tribunals Service provides a Form N2 for making a court claim to challenge a probate decision.
The appropriate procedure depends on the circumstances, including:
- whether the will is being challenged;
- whether probate has been granted;
- whether estate assets have already been distributed;
- what evidence exists; and
- what remedy is being sought.
This is why acting promptly after discovering a suspicious will can be important.
Making sure a will is legal — useful for the section explaining signing, witnesses, and validity.
GOV.UK – Make sure your will is legal
Can I challenge a will because my sibling received everything?
Not necessarily.
An unfair result is not automatically an invalid will.
Your parent may have had perfectly valid reasons for leaving most or all of their estate to one child.
For example, they may have:
- provided financial support to another child during their lifetime;
- wanted to reward a child who cared for them;
- had a close relationship with one child;
- wanted to provide for grandchildren;
- changed their wishes following a family disagreement.
The court does not generally rewrite a person’s will simply because family members consider the outcome unfair.
The question is whether there is a recognised legal basis for challenging the will.
What if my sibling was caring for my parent?
This can be an important factual circumstance, but it does not automatically mean that the will is invalid.
A parent may legitimately leave more to the child who cared for them.
However, if the evidence suggests that the sibling used their position to control the parent or force them to make a particular will, the circumstances may require closer examination.
For example, concerns may be greater where the sibling:
- controlled access to your parent;
- managed their finances;
- prevented other relatives from visiting;
- arranged the will appointment;
- was present during instructions;
- benefited substantially from the new will; and
- pressured the parent to sign.
No single fact necessarily proves undue influence.
It is the overall circumstances and available evidence that matter.
Grounds to contest a will
Can I challenge a will while my parent is still alive?
Generally, a person cannot contest their parent’s will as though the parent had already died.
A will is intended to operate on death, and your parent may change it during their lifetime.
If you are worried that someone is currently pressuring or exploiting your parent, the situation may require a different legal approach.
The most important point is that your parent remains the person entitled to make their own decisions, provided they have the necessary capacity and are acting voluntarily.
Does a new will automatically cancel the old will?
Not necessarily in every situation, but a later valid will can revoke an earlier will.
GOV.UK advises that when making a new will, it should explain that previous wills and codicils are revoked.
HMRC guidance also explains that revocation can be express or implied, including where a later will is inconsistent with an earlier one.
Therefore, if your sibling arranged for your parent to make a new will, the existence of an older will does not by itself mean that the older document controls the estate.
The issue is whether the newer will is valid.
What if my sibling hid the old will?
Hiding an earlier will does not necessarily make a newer will invalid.
However, it may become relevant evidence depending on the circumstances.
For example, if your sibling deliberately concealed an earlier will while trying to establish a later document that benefited them, that could raise questions about their conduct and the administration of the estate.
You should preserve evidence showing:
- who had possession of the earlier will;
- when it was last seen;
- whether the sibling knew about it;
- what happened to it;
- whether a later will exists; and
- whether probate has been applied for.
The court can consider the evidence when determining the appropriate legal position.
How long do I have to challenge a will?
There is no single answer that applies to every type of will dispute.
Different claims can involve different rules and deadlines.
For that reason, you should not assume that you can wait indefinitely simply because you have discovered a suspicious will.
If you think a sibling changed parents will, obtain legal advice as soon as possible, particularly if:
- probate has been applied for;
- a caveat may be appropriate;
- estate assets are being sold;
- money is being distributed; or
- important evidence may disappear.
GOV.UK confirms that a caveat is relevant before probate is granted and that it initially lasts for six months.
Frequently Asked Questions
Can my sister secretly change my parents’ will?
No. Your sister cannot simply rewrite your parent’s will and make the alteration legally effective. If she arranged for your parent to make a new will, the key issue is whether your parent made that will voluntarily, with the necessary capacity and in accordance with the legal requirements.
Can my brother change my parent’s will without them knowing?
A brother cannot validly change your parent’s will behind their back. If you believe the document itself has been altered, forged or replaced fraudulently, preserve the evidence and obtain legal advice.
What if a sibling pressured my parent to change their will?
Pressure does not automatically invalidate a will. However, if improper pressure or coercion caused your parent to make a will that did not represent their genuine wishes, undue influence may become relevant.
Is a new will suspicious if it leaves everything to one sibling?
Not automatically. Parents are generally free to decide how their estates should be distributed. A dramatic change may justify asking questions, but it is not by itself proof that the will is invalid.
Can I challenge my parent’s will if I was left out?
Possibly, but being left out does not automatically mean that the will can be challenged. You would normally need to identify a legal basis for the challenge, such as lack of capacity, undue influence, lack of knowledge and approval, improper execution, fraud or another relevant issue.
Can I see my parent’s will before they die?
A will is generally a private document during the will-maker’s lifetime. Your parent does not normally have to show it to their children.
What happens if my sibling destroyed the original will?
The consequences depend on the circumstances, including whether another valid copy exists and whether the deceased intended the will to be revoked. This can become a complex probate issue requiring specialist advice.
Can a solicitor tell me whether my sibling changed the will?
A solicitor may be able to investigate the circumstances, subject to confidentiality and other legal restrictions. The solicitor who prepared the will may have relevant attendance notes and records, but those documents may not automatically be available to every family member.
Can I stop probate if I think my sibling changed the will?
If probate has not yet been granted, you may be able to enter a caveat where there is a genuine dispute. GOV.UK confirms that a caveat can stop a grant of probate being issued while the dispute is addressed.
What if probate has already been granted?
You may still have legal options, but the procedure can be more complicated. HMCTS provides a probate claim process for challenging probate decisions.
What should I remember if I think a sibling changed my parent’s will?
The most important point is this:
A sibling cannot simply change a parent’s will and make the change valid. But a sibling can be involved in a legitimate change to a parent’s will, and involvement alone does not prove wrongdoing.
If you suspect a sibling changed parents will, focus on the evidence surrounding the change.
Ask:
- Was the new will properly signed and witnessed?
- Did your parent understand what they were signing?
- Did they give the instructions themselves?
- Was anyone putting pressure on them?
- Was your parent dependent on the sibling?
- Was the sibling heavily involved in preparing the new will?
- Is there evidence explaining the sudden change?
- Is an earlier will available?
- Has probate been granted?
If the answers raise serious concerns, specialist legal advice can help determine whether there are grounds to challenge the will.
Contest A Will Today can help you understand the potential issues surrounding a disputed will and the next steps that may be available.
England & Wales legal scope
This article concerns wills and probate in England and Wales. Probate and inheritance rules can differ in Scotland and Northern Ireland. GOV.UK specifically distinguishes the probate processes between these jurisdictions.
This article provides general information and is not a substitute for legal advice on the facts of an individual case.
