I wonder if your father-in-law booked the trip....like it's a gift to you and your family (but of course, you could pay him back), would that work? It might be worth looking in to.
I know 2 families who are going....one family had the code, the other family did not...both families are getting the free dining because they are booking together as a Grand Gathering Group. This was suggested by the CM making the reservations, so it's not like they were trying to cheat the system.
Stacy