2.18 In the case of being a family member of a Thai national (applicable only to parents, spouse, children, adopted children, or spouse’s children):
(1) The alien must have been granted a non-immigrant visa (NON-IM).
(2) The alien must have proof of relationship.
(3) In the case of spouse, the relationship must be de jure and de facto; or
(4) In the case of children, adopted children, or spouse’s children, said children, adopted children, or spouse’s children must not be married, must live with the alien as part of the family, and must not be over 20 years of age; or
(5) In the case of parents, the father or mother must maintain an average annual income of no less than Baht 40,000 per month throughout the year or must have deposited funds of no less than Baht 400,000 to cover expenses for one year.
For other necessary cases, the Commander or Deputy Commander of Immigration Bureau is granted the authority to make decisions regarding approval on a case-by-case basis.
(6) In the case of marriage to a Thai woman, the alien husband must earn an average annual income of no less than Baht 40,000 per month or must have no less than Baht 400,000 in a bank account in Thailand for the past two months to cover expenses for one year.