The only thing he needs to prove is that he has a reason to return. The visas are processed in new york now and they look very carefully at what is written on line.
1. he needs to have a job and state how much money he earns here
2. If he owns property he needs to state how much it is worth
3. he needs to state his income here
he will need to take all supporting documents to the Uk embassy here including titulars for property and letters from employers, plus the letter of invitation from you.
I suggest he says he is only going for a short time like 2 or 3 weeks. If you want any more advise on specifics then feel free to pm me.
matilda
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