M.N.
If this family was open and honest enough to tell you about the short sale of their home maybe its worth giving them a chance. I can bet you their credit report isn't pretty. If you feel they are a good match sit down and be very open with them rent has to be paid. You can get a rental agreement written up with them and stick to it. If they had to do a short sale because they were in over their heads financially because of today economy maybe its worth given them a fresh start. They may really love and take care of the home better than a person with a good credit score. If this was you in ther position what would you want someone to do for you?