@Laine ***************
I guess your talking about the TM30 right.
Who said the rules changed??
The best thing you can do is go to immigration tomorrow bright and early.
Take with you (parents to take)
Copy of passport.
Copy of TM6 (departure card)
2 x passport photo
1900thb each for a 30 day extension.
Worst case scenario will be that the extension will be denied and they will receive a 7 day extension (not an extension but additional time to leave the country)
This should keep them up to date with stamps in their passports.