@Mauricio *****

Regarding overstay and children:

A child under 15 years of age can not be fined or deported for being on overstay, and a child under 18 years of age can not be deported and only fined 20K THB.

My opinion: Have the child enter on a tourist visa/ visa exempt/ or whatever valid visa, get the child's Thai passport, border bounce (by air only!) out of Thailand with the child and return on the Thai passport.

@Mauricio *****

And does the child have legal citizenship in Thailand?

1. how old is the half-Thai child?

2. How long will you be in Thailand?

Health insurance is not required for a one year extension of stay based on marriage

I believe the question has been answered, and I'm closing comments. If anyone wants commenting reopened, please send a message to an admin/ moderator.

IF the person's passport is a visa exempt, and they didn't get any non-immigrant visas, then they can get another 60 day extension of stay based on unable to travel due to COVID-19

1. Where's Maenam immigration ? Is that Suratthani immigration?

2. What is the most recent visa? I have no idea what "stamp on arrival" is.

You have two options:

1. WAIT until around the middle of March, and see if they will extend the 60 day extension of stay based on unable to travel due to COVID-19. If they do, then apply for that OR;

2. On March 22rd, go to the immigration office and apply for another extension of stay. It will be rejected, and you will receive a 7 day extension of stay denied stamp. At most immigration offices, the extension of stay denied stamp begins on the date you apply for the stamp.

@Peter ******************

Which immigration office?

@Jess *******

Yes you can. You'll have to apply for an in-country Non-O Visa based on being over 50 first, and then you can apply for a one year extension of stay based on retirement.