Last updated on April 18, 2026
Under Sections 1547–1560 of the Thai Civil and Commercial Code, a child born out of wedlock is legitimated with respect to the father only by subsequent marriage of the parents, registration of legitimation at the amphur with mother and child’s consent, or a court judgment. Without legitimation the biological father has no parental rights or automatic duty of support, even if his name appears on the birth certificate.