Word of warning I was the executer of a thai/English will of a good friend who made his home in Thailand I’m sure that your all aware that the 800k cannot be in a joint account meaning when that person passes to the next world that money should go to his estate . When I presented all the documents to his Thai bank they were not interested in releasing the monies unless a written document was issued by the courts a long and very frustrating journey you have to get a lawyer who then goes to court to request the document required that alone is good enough reason to consider using professional agents and avoid having large sums in your thai bank !