Likely that ม่ถูกต้อง is legal, because children under the age of 21 to the underage should get advice from parents also. Parents need to purchase soft drinks, bottled water, with him.
Likely not legitimate because children under the age of 21 are minors should be guided by their parents also. Parents need to order a drink, then the drink to him.
Likely that not legally because children under the age of 21 underage should get advice from parents also. Parents need to order drinks water to drink with him.