Under Thai law, an unmarried father has no automatic legal rights over his child — even if his name is on the birth certificate. Legitimation is the legal process that establishes your rights as a father and protects your child’s future.
Section 1546 — A child born to unmarried parents is deemed the legitimate child of the mother alone. The biological father has no legal rights unless legitimation is completed.
Two routes: Register at the District Office (with mother’s consent), or petition the Juvenile & Family Court if consent is refused or cannot be obtained.
Without legal legitimation, a biological father in Thailand has almost no enforceable rights over his own child.
You cannot make decisions about your child’s education, healthcare, religion, or daily welfare without court orders.
Without legitimation, taking the child abroad — even to visit your home country — may constitute an offence without the mother’s written consent.
An illegitimate child cannot inherit from the father’s estate in Thailand unless legitimation is completed. This also affects foreign estate claims.
Without legitimation, the child cannot officially use the father’s surname, and adding the father’s nationality to passport applications becomes difficult.
For dependent visas, dependent benefits in your home country, or foreign child registration, proof of legal paternity is typically required.
Once legitimated, you gain equal parental authority with the mother: custody rights, decision-making power, the child’s right to your estate, and your duty of financial support.
Thai law provides two routes. The right one depends on whether the mother consents.
The faster, lower-cost route — available only when the mother and child (if aged 7+) both consent in person before the Registrar.
Required when consent is refused, when mother objects, or when mother’s whereabouts are unknown. Filed at the Juvenile & Family Court.
Under Section 1555, the petition must prove paternity through one or more of these grounds:
Gather these before your first consultation. We will help you prepare and translate what is needed.
From first call to final registration — here is what to expect when you work with us.
We assess your situation by phone or LINE. We will tell you which route applies (District Office or Court), what evidence you have, and what the realistic timeline is.
Free of chargeWe review your documents, advise on any gaps, and prepare certified Thai-English translations of foreign documents required by the court.
1–2 weeksIf the mother is likely to consent, we first attempt the faster administrative route at the District Office. This avoids court proceedings entirely if successful.
Fastest routeWe draft and file the petition at the Juvenile & Family Court in Nakhon Ratchasima. We represent you at all hearings — you do not need to attend every date.
Court routeWe present your evidence, arrange DNA testing if ordered by the court, and handle all communication with the court in Thai on your behalf.
3–6 months typicalOnce the court pronounces judgment, we register the legitimation at the District Office. The child is now legally your child under Thai law. We assist with updating the birth certificate and house registration.
Case completeTell us your situation. We offer a free first consultation by phone or LINE. All communications are strictly confidential.