Long story, as these things usually are.
Last year, I took the Mrs (Thai), myself (American) and the daughters (Thai/US) to HK Disney.
Met them at the airport and the Mrs, naturally, only brought the girls US passports.
Decided not to cancel the trip and went.
Upon return, the girls got a 30 day tourist stamp as did I.
Went to Jomtien & Chonburi Immigration and they will only give the girls US Ed visas now and will not out stamp the US passports and In stamp the Thai passports.
What in bloody hell do I do now?
Daughters dual citizen issue
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They can apply for 1 year extensions on the basis of being Thai.
The only way to resolve the immigration statuswould be to exit on the USpassport and re-enter using a Thai passport.