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Under Thai law, if you have do not have a will, or valid last will in Thailand, the law says what happens to your assets when you die, meaning it will be distributed among the statutory heirs, section 1269. The answer to your question can be found in the civil and commercial code, chapter succession and inheritance.
Below the sections about disinheritance
Section 1608. A de cujus may disinherit any of his statutory heirs only by an express declaration of intention,
by writing deposited with the competent official.
The identity of the disinherited heir must be clearly stated.
However, when a person has distributed all his estate by will, all his statutory heirs who are not beneficiaries under the will are deemed to be disinherited.
Section 1609. A declaration of disinheritance may be revoked.
If the disinheritance has been made by will, the revocation may be made only by will; but if the disinheritance has been made in writing deposited with the competent official, such revocation may be made either from prescribed in Section 1608 (1) or (2).