The matter of fact that his wife and kids obtained the B1/B2 Visa from US consulate of his country of origin is a big red flag towards his refugee case in US. The problem is that they must omit or intentionally lied something in their VISA application, and if later it comes out of the light, they can be banned by US for life for misrepresentation.
No. If you can not see the whole picture then don't conclude. Being called a liar because I asked for advice is quite impolite! If something in what I have said so far is unclear, please ask and if I deem it necessary, I will respond, with the the truth. Not everyone is a liar. The truth often gets you the furthest and with less hassle too.