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SUWANVARA LAWFIRM
Suwanvara Law Firm Co., Ltd.
SUWANVARA LAWFIRM
SUWANVARA LAWFIRM
Suwanvara Law Firm Co., Ltd.
Family and Inheritance Law

Can I Make a Will Leaving All My Assets to Only One Child? Can the Other Children Sue?

You want to leave the whole house and land to the child who looks after you. Thai law allows this, but there are conditions people often overlook — until the will is challenged. This covers marital property, witnesses, and the testator's capacity.

by Legal Advisory TeamSeptember 13, 20265 min read
Can I Make a Will Leaving All My Assets to Only One Child? Can the Other Children Sue?

"I have two children, but I want to give everything to the daughter who has always taken care of the mother. Can I do that? Will the other child sue later?" This is a question the firm receives from many parents.

The short answer is you can. Thai law does not require that the inheritance be divided equally among all children. However, this type of will is the will with the highest chance of being contested, so it must be drafted more carefully than usual.

Thai law grants freedom to make a will

Some countries have "reserved share" rules that require a portion of the estate to always be set aside for children or a spouse. Thai law has no such rule. An owner of property may make a will giving their property to anyone, in any proportion — to a single child, to a grandchild, or to someone outside the family.

Distribution to statutory heirs by order of precedence, such as all children receiving equal shares, applies only in two cases:

  • There is no will
  • There is a will, but it does not mention certain assets — those assets pass to the statutory heirs

What Can Be Bequeathed Is Only Your Own Share

The most common mistake is marital property. A house or land bought during the marriage is generally owned half by each spouse. If the mother makes a will giving "the whole house" to her daughter, the result is that she can give only the half that belongs to her; the other half still belongs to the father.

If you want the entire property to truly pass to a single child, you should

  • First check whether each item of property is separate property or marital property
  • Have the spouse make a will bequeathing their share as well, if they agree
  • If the spouse has already died, the spouse's share may already have passed as inheritance, and that share must be dealt with first

What can the other children sue over?

If the will is valid, the other children cannot claim merely that they are children in order to ask for a share, but they can still sue to contest the will itself. The issues most often raised are:

Made in the wrong form – An ordinary will must be made in writing, dated, with the maker signing in the presence of at least two witnesses who are present together at that time, and the witnesses must sign as attestation. A will that is typed and signed alone with no witnesses is not a holographic will.

A witness is a beneficiary – A witness to the will and the witness's spouse cannot receive property under that will. If a daughter or the daughter's husband signs as a witness, the provision granting property to the daughter fails, which in this case is the entire document.

The will maker lacked capacity – For example, being ill to the point of being unresponsive, or having already been placed under a court order of incapacity.

Fraud, coercion, or mistake – The most popular argument is "the child who was taking care of mother took her to sign when she did not know what was going on."

How to make this kind of will difficult to contest

  1. Choose neutral witnesses — not a child who receives the assets, not the spouse of a child.
  2. Make it while your health is still good — the closer it is made to the end of life, the easier it is to challenge on grounds of capacity.
  3. If you are elderly or have a congenital disease — obtain a medical certificate from a period close to the date the will is made and keep it.
  4. Keep the child who receives the assets out of the room at the time of signing, to reduce allegations of undue influence.
  5. Write a short explanation — for example, that this child has taken care of medical expenses for many years. This is not a legal condition, but it helps the reader understand your intention.
  6. Include a clause giving away all remaining assets so that property acquired later does not pass to statutory heirs.
  7. Appoint an executor in the will, and appoint a substitute as well.
  8. Keep the original in a place that can be found, and tell the executor where it is kept.

Other options worth considering alongside it

Transfer while you are still alive A gratuitous gift that has been registered takes effect immediately. The property does not become part of the estate, so the other children have no property to divide. But changing your mind later is very difficult, and the giver must plan for their own housing. Read the details in How transferring land to a child while you are alive differs from a will

Register a right of habitation or a usufruct If you give the house to one child but want your spouse or another child to still be able to live there, a right registered at the Land Office attaches to the property even if the owner changes.

Talk to all the children first This is not a legal requirement, but a will whose reasons the other children knew from the start is less likely to be challenged than a will read for the first time after the funeral.

When It Comes Time to Use a Will

Even with a will, banks and the Land Office generally still require a court order appointing an estate administrator. Other children have the right to object at this stage. A will that is carefully drafted as described above is what makes this process finish quickly. See the full process in the Heirs and Estate Administrator's Guide

📌 See more: Estate and Wills · Family Law

If you are thinking of making a will that gives assets to any one child, consult our team of lawyers or call 092-254-2045 before signing.


This article provides general information and is not legal advice for any specific case.

Frequently asked questions

Does Thai law require the estate to be divided equally among all children?+

No. Thai law gives the asset owner freedom to make a will, and they may give their assets to anyone in any proportion. There is no reserved share that must be set aside for the other children. Equal division according to the order of statutory heirs applies only when there is no will, or when the will does not mention that asset.

Can a child who receives no inheritance sue to have the estate divided?+

If the will is made in the correct form and covers all the assets, the other children cannot claim a share simply on the ground that they are children. However, they can sue to challenge the validity of the will — for example, that it was not made in the correct form, that a witness is a beneficiary, or that the testator lacked capacity or was deceived or coerced. Wills that are challenged often therefore fail at the execution stage, not on the content.

The house is marital property — can I leave the whole house to a child?+

By will, you can give away only your own share. Marital property belongs half to each spouse; the other half belongs to the spouse. If you want the entire house to pass to one child, the spouse must also make a will giving away their share, or the two of you must plan it together.

Do I need to write the other children out of the estate?+

If the will already gives away all the assets, the other children will not receive those assets in any case. But assets acquired later, or assets that were overlooked and not specified, will pass to the statutory heirs. Including a clause giving away all remaining assets helps close this gap. As for expressly disinheriting an heir, that can be done, but you should consult first, because it often makes the conflict more severe.

Is it better to give the assets now, or to write a will?+

It depends on which risk you fear more. A gift made during your lifetime takes effect immediately and avoids having to administer an estate afterwards, but it is hard to change your mind. A will, on the other hand, can be amended at any time and the maker remains the owner until death, but the heirs must apply to have an estate administrator appointed and there is more room for a challenge.

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