TLDR : Answer Summary
To obtain a 60-day visa extension based on marriage or family in Samut Prakan, the following documents are required: a signed and notarized marriage certificate (if applying as a wife), birth certificate for dependents, 'tambien baan' of the wife or dependent, ID card of the wife or dependent, copies of all passport pages with ID and stamps, a TM30 receipt dated from the last entry, 1900 baht fee, a passport photo, and the presence of the wife or child for photographs. Some documents, such as the Kor Ror 22, are not needed contrary to other reports.