What documents are needed for a visa as a parent of a Thai child, apart from the birth certificate and passport?

Inquiring about the necessary documents for applying for a visa as a parent of a Thai child, beyond a birth certificate and passport. Community responses advised visiting the local immigration office for specific requirements as they can vary by location. Commonly suggested documents include the child's birth certificate, a house registration book, the Thai mother's ID and house registration book, and potentially proof of legal parentage such as a family court decision. Some users mentioned experiences with specific document requests at various immigration offices, highlighting that requirements can differ across regions.