How can I extend my marriage visa for an additional 60 days in Thailand?

if Arrival Date was 24 October 2025, then are you sure it was 22 January 2026, as for a Non–O E–Visa based on Thai Wife Single Entry, the date on your Entry Stamp should be 21 January 2026 ( 24 October 2025 to 21 January 2026 )

You'll need your Thai wife to attend immigration with you, along with proof of your marriage that's registered in Thailand. Some immigration offices might start the extension the day you apply, and some might add it to the end of your entry stamp. This is a generic list of requirements, as each immigration office sets their own requirements.

Do note: not every immigration office offers the 60 day visiting Thai family extension.