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?
TLDR : Answer Summary
The user is planning a stay of 3 to 6 months in Chiang Mai and is questioning whether they need to book a flight out of Thailand before the 60 days allowed by their Multiple Entry Tourist Visa. The comments suggest that they should not have any issues with immigration if they have a round trip ticket, although it's important to file a TM 30 form shortly after arrival. Regarding their children, while there is some uncertainty, it appears that children under 15 do not strictly need a visa but will receive a visa exemption; they could potentially be stamped in for 30 days and may be allowed to leave without penalties for overstaying.