When a marriage is unlawful or invalid under the laws of Thailand it means that the marriage was void and invalid from its beginning. Sections void of marriage under Thai family and marriage laws.
VOID OF MARRIAGE
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Section 1494. The marriage in Thailand will be void only as provided in this Chapter.
Section 1495. The marriage which is made against Section 1449, Section 1450, Section 1452 and Section 1458 shall be void.