Perhaps the first thing to do is to take the plunge and ask him how he feels about going into business with you. He can only say yes or no. I know to him it would be a small beginning, but when things are that desperate, even a small beginning is better than nothing, and in this family's dire circumstances, he must surely see that he needs to take any opportunities that arise. Maybe he wouldn't feel so patronised if you said that as he had been so successful you'd really appreciate the benefit of his experience, which you probably would.
He's clearly an intelligent man, and he knows that his family must begin a new life. As a businessman he will also be aware that things work differently in England and that he has a lot to learn, but if you're happy to take him on board (and be sure you are!), why not try broaching the subject just to see how he feels? It could end up being beneficial to both of you.
Fingerprint, there are several charities who provide furniture, etc, for people in need - and can even find alternative accommodation if necessary. I'm sure your church will know of some, but if not, in practically every town there's a voluntary services bureau that can probably point you in the right direction.
And Wiz's right - he is lucky to have you as a friend.