Marina,
What a great report. I can't believe that you put up with all that. I would have left them from the start.
We are going on a family trip in December and I have a feeling that I am going to end up with a similar TR to yours. It will be DH, baby, & I, my parents, Sister & BIL. We are using our DVC points for a 2 bedroom AND a studio so everyone has lots of space. My parents are paying for all the meals. All my sister & BIL have to pay for are their park tickets. Well, Funsucker (that is how we refer to my BIL) doesn't want to pay that much money for a 3 day park hopper. So he is trying to get us to rearrange the schedule so they only do one park a day and only need a 2 day park pass (no idea how that is going to work). We DH & I have already decided we are going to do whatever we want (especially since we will be working around baby's schedule) and just meet them for meals. We are also going to have my parents stay in the 2brdm with us and give them their own studio so we don't have to hear them and that will be their christmas gift. We really didn't want to reward them with their own room, since he is being such a PIA, but we figured it would be easier for us.
I will have to keep everyone posted as to what happens as we get closer.