Can my son extend his 45-day visa exempt entry stamp while living at my address in Chiang Mai?

The user in Chiang Mai is inquiring about extending their son's 45-day visa, seeking to know if they can declare their address on the extension form along with a TM30 receipt. A comment clarifies that their son is on a 45-day visa exempt entry stamp and can apply for a single 30-day extension for 1900 baht at the immigration office. It is recommended to go to the immigration office in Central Festival Mall, as it is less busy, and suggests accompanying the son to ensure compliance with TM30 filing.