What documents are required to apply for a 60-day extension based on visiting family while on a Non-O visa in Thailand?

To apply for a 60-day extension based on visiting family while on a 90-day Non-O visa, you should check with your local immigration office for specific required documents, as this may vary. It is suggested to visit the immigration office well in advance of your visa expiration to confirm the document requirements and clarify that you are applying for the 60-day family visit extension, not a year-long extension based on having a Thai child.