1 Comments Immigration law, student visa, employment visa, partner visa
The fact that the other two are in Vietnam, will not allow you to claim any special privileges for him, despite the other circumstances you have advised.
What is his age?
What is his financial circumstances?
Would he be looking to come here to work, or would it be to retire?
Does he have any special skills?
Answers to these may assist others to advise you his best course of action, I don't know, sorry.