My wedding is taking place in two weeks. My parents and my fiancés' parents are paying for the reception (the food/venue rental). My FFIL just informed me that he's ADDING additional people to the wedding list. These are people that are not on our original list.
I'm trying to explain to my fiancé that it's rude to do this. He doesn't think what his dad is doing is wrong. I'm personally freaking out. What do I do? My FFIL is paying. We've had no issues with guest lists or etiquette prior to this issue.