If you are not back before the last date of your permission to stay date, it has absolute no value to buy a re-entry permit as that will be valid until the same date.

Look up the requirements for a new Non Immigrant O visa based on being married to a Thai National, bring all needed copies on the trip and apply for a new visa while abroad.

@Roger ********

Okay,

Just put a date for departure of Thaiand on your application within the 60 days period you get on arrival using the visa.

2 months visa better known as a Single Entry Tourist Visa which gives 60 days on entry.

You can get once a 30 day Extension of Stay based on tourism, than a 60 day Extension of Stay based on visiting family and you might convert your visa into the Non Immigrant O visa based on being married, but for that you need 400.000 Thb on a Thai bank account and some other copies of legal documents.

@James *******

I read to many questions which half of them has nothing to do with the question of the OP. I gave my advice.

@Adam *******

No, only before application as mentioned

If you are using income made in Thailand, it will be copies of work permit and the last 3 months of paying income tax and sso for you and for the Thai employees needed to get the work permit.

Your minimum Thai wages must be 40.000 thb a month.

Apply for the Non Immigrant O visa based on having Thai child before you make your way into Thailand. No hassle with flights and visa exempt entry.

Get 90 days on entry and apply for the 60 days extension to visit family. Use the visa designed for this situation.

I have no idea where in Thailand the OP is going to live, but I know for sure that he can go after 45 days, they will inform him to make all needed copies and let him apply or inform him he has to wait a few more days and make an appointment to get thins done on the easy way.

Get the Non Immigrant O visa before you travel, get stamped in for 90 days and after 45 days visit Immigration to apply for the 1 year Extension of Stay. Less visits to Immigration and less hassle.

Single Entry Tourist Visa gives 60 days, once the extension is an extra 30 days, than conversion to Non Immigrant O gives an extra 90 days, yes easy to do if you can meet the requirements.