Need Texas mortgage broker for a Sub2 seller. Loan will be in TX

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A couple of years ago we bought a property sub2 from a seller. Since we have been making timely payments on the seller’s behalf it has increased his credit score to the point that he wants to buy another house and he is back on his feet without a foreclosure. ;) Whereas the two loan officers that he talked with does not know how to document the sub2 sell in such a way that it is not showing negative on his Debt to income ratio I’m looking for referrals. :) 

Thanks so much in advance