Slightly different problem for me... 
  
Saw the info about the private cash, so I requested brochures... 
  
Got one with a coupon, (son's name), and used it two weeks ago for the purchase of an Explorer for my wife.  No problems with it... 
  
Now, I am looking at an Edge.  Started shopping a week ago, so requested more brochures.  2 -- YES 2!  new brochures came today in the names of my other son and my wife.  Each has a coupon for the $750.   
  
Here is the question.  Can I now use for a SECOND purchase (these were sent out after the first purchase).  Or does the "One per household" rule mean only one for a certain period of time, or forever, etc...? 
  
HELP!!!! 
  
  
EDIT:  In case it makes a difference, first car was in my wife's name alone.  New car will be in mine alone...