Is it easier to apply for a Thailand visa extension based on marriage or having a child with a Thai citizen?

The preference for applying for a visa extension based on marriage or having a Thai child depends on the individual's circumstances. If you are married to the Thai mother, you must apply for the extension based on marriage. Alternatively, if you are not married but have custody of the Thai child, you may apply as a parent of a half-Thai child. The requirements differ slightly; for example, when applying based on a Thai child, the process can be simpler in terms of financial requirements, but the visa is only valid until the child turns 18.