I have searched the internet and cannot find an answer, hoping someone can help. We are planning a 3 (possibly 6) month stay in Chiang Mai at the end of the year. I have found that we will need a Multiple Entry Tourist Visa that grants us a 60 day stay with the possibility for a 30 day extension. My question is, if we buy a round trip ticket from the US that has us leaving on day 90, will we have a problem with immigration? Or do we need some sort of flight booked out of Thailand before day 60?
Also, we are traveling with our two small children (4 & 1), do they need visas as well?