M.P.
I suggest that the fact that this is taking so long is an indication that there is no job available. I suggest that the cousin is not telling you this because he's still hoping or that he's not wanting to face you.
I suggest that you either forget about this angle or that you directly ask the cousin what is going on. Either way definitely continue to search for employment. Since he's interested in driving truck, I recommend that he go ahead and arrange for training. If the cousin were to come thru he can still opt out of the idea of driving truck.