You can apply for a visit family extension for 60 days off of the Non O.

No. The first extension off a Non O has to be for the same reason you got the Non O.

After the year extension you can change the reason for your next extension from marriage to a Thai child.

No. Almost certainly you can’t get without the help of an agent.

Not quite sure what you’re asking here. If you have a Non O visa (rather than a Non OA) it’s not multiple entry. It’s a single entry visa.

On entry you’d get a stamp for 90 days (actually 89 further days as day 1 is your entry day).

Official website is here. It’s free.

Other sites charge up to $120.

@Tom *******

You can’t convert from a OA to an O in Thailand. You would have to let the OA lapse and leave to re-enter visa exempt or buy a tourist visa to convert to O or buy a O prior to arrival.

Your Dad having funds won’t work for your application. You need your own funds to apply.

If you have a spouse or kids then you can provide a sponsorship letter for their application.

You may have a hangup with your air carrier. Some want to see a ticket out of Thailand within the number of days allowed by your entry scheme.

With no visa that would be 60 days regardless that you could get an extension.

Some insist others don’t seem to care. Ask yours for their policy or be prepared to buy a ticket out upon check in to be able to board your flight.

@Latif *****

If you stay in country for 90 consecutive days you must report to immigration. A DTV visa allows you to stay for 180 days (and with extreme difficulty perhaps 360) so you need to report your presence to immigration each 90 days.

It’s called a 90 day report for a reason.

Entirely possible if you’re from a country that allows visa exempt entry. Your profile suggests you are.

No one can confirm if it’s going to be without hassle as entry is up to an individual immigration officer. If they’re having a bad hair day then you might get questioned or at an extreme denied. The latter probably won’t be the case but it has happened.