Is it acceptable to state my intention to stay longer with family when applying for a tourist visa extension in Thailand?

A user who has been visiting Thailand every six months for years is applying for a 60-day tourist visa for the first time and planning to stay with their girlfriend. They are unsure if they should state family reasons for extending their visa or simply claim tourist purposes. Responses suggest that since they are applying for a tourist visa, they should identify as a tourist, especially since extensions on such visas are typically granted for tourist reasons. However, if they have legitimate proof of being a father to a Thai child, they might qualify for a family visit extension. The TM30 form is also crucial for residency proof when applying for the extension.