A Thai-foreign family needing documents in both countries — how should the paperwork be prepared?

The scope of this answer is “A Thai-foreign family needing documents in both countries”, so it covers both the requirements attached to this document set and the order the steps must follow. The terms that frame this page are Thai-foreign · family · needing · documents. The deciding factor is the receiving body's requirement, not only the format of the Thai-side document. What changes the timeline most here is whether the source documents are complete on day one. Before starting, count the number of certified sets needed before work starts, because extra sets restart the certification steps, then verify the source document is still within any validity window the recipient applies, then check that names are spelled identically to the passport or ID card on every page. If multiple certified sets are needed, order them all in the first round to avoid re-queuing. Plan the schedule with room for at least one review cycle at the receiving office. High-resolution photos of seals and signatures help when the destination asks for re-verification. Note who signed each certification and on what date for later reference. After certification, scan the full set before it leaves your hands. A foreigner permitted to stay temporarily beyond ninety days must notify their address to the competent officer every ninety days under section 37(5) of the Immigration Act B.E. 2522, and the house master or owner accommodating a foreigner has a separate duty to notify under section 38, filed in practice on form TM.30. Both are handled by the Immigration Bureau, Royal Thai Police. A Thai document used overseas normally follows one order: obtain the original or an official copy from the issuing office, have it translated faithfully, submit it for legalisation to the Legalisation Division of the Department of Consular Affairs at the Ministry of Foreign Affairs, then have the destination country's embassy or consulate legalise it where that country requires it. Thailand is not a party to the 1961 Apostille Convention, so no Apostille is issued for Thai documents. Given name, family name, date of birth and passport number in the translation must match the passport and be consistent across every document in the set. Where a name was changed or spelled differently on older papers, attach the change-of-name evidence. A single-character mismatch is the most common reason a receiving authority sends a file back. Cost and lead time depend on page count, target language, how many certified sets are required and the steps the receiving authority sets, so every file is quoted before work starts. Send scans of every page together with the checklist the authority or school gave you, via LINE @NAATI, call +66 80-557-8887 or email ilc@thainotary.co.th.

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