What visa should I apply for if I plan to stay in Thailand for 4 months with my Thai family?

It depends on where the marriage took place (Thailand, or outside Thailand) as to what documentation you need to apply for the family visit extension. Inside Thailand is easier. Outside Thailand may require the translation of documents.

@Steve ******

I do not believe so, but you need to make sure the marriage is registered at a local amphur office. Generally, you need the following when you apply for the family visit extension:

Married with Thai national with marriage certificate. (signed by both persons)

( Korror 2 and 3 or Korror 22 and foreign marriage certificate)

Signed wife ID card copy

Signed copy house book (Blue Book)

@George ************

i wish I would’ve known about this before I wasted time on a STV. Is there a certain amount of time you have to be married before you can apply for the marriage extension?

@Steve ******

I believe the visit family extension is available to those who are married to a Thai regardless of how they entered Thailand (visa-exempt entry, Tourist Visa, etc.). You can, however, apply for only one 60-day extension of stay to visit family per entry to Thailand. I think you get to choose when you apply for the visit family extension. In other words, you can first apply for a regular 30-day extension of stay available from a visa-exempt or a Tourist Visa entry. You can then, if it is still available, apply for a 60-day covid extension. After that, you could apply for a visit family extension (60 days). If you wish to stay for the maximum time the visit family extension should probably be the last extension you apply for as it can be applied for at any time during your entry.

@Steve ******

If it's a SETV, you an apply for a 60 day extension of stay based on marriage to a Thai national. IF you are here when the 60 day extension of stay based on unable to travel due to COVID-19 are being sold, apply for that first