Mortgage co-borrower question for a lender?

My fiancee's parents have asked us to buy their home once my fiancee got pre-approved for a home loan when we were doing a little house searching of our own, I have the money for the down-payment, he has the credit and income, except we don't want to live there, and the loan is an owner occupant loan, so we were thinking we could add his brother to the loan who does live there. His brother works in the self employed business with his father and has no proof of income and no real credit. Basically the 3 of us would be on the loan together, or maybe just the two of them, depending on which way works best. My fiancee with the income and credit, him for the owner occupancy and me for the down-payment. Is this possible?