It seems to me, Estelle has a bit of a hard time saying "no" and establishing some boundaries. Chris' parents should have asked permission first if E&E would be okay sharing their space, and either one of these two adults, probably Estelle, since this is her family, could have said "no." Estelle needs to work on that spine of hers.
On the other hand, I don't think full privacy is something that should be fully expected in this situation unless someone has their own trailer, RV, tent, or what-have-you. If the bunker is considered "common area" by the owners and should be expected to accommodate four people, whoever gets the bunker should probably expect that they might have to share, depending on the number of people that need accommodations, the same as the living room hide-a-bed.
This situation, however, was out of line. Permission should have been asked. There were plenty of other accommodations for Chris to make use of. He could have stayed in the trailer with his folks.
This issue with Alma continues to bother me. Now she has a baby, so she gets claim on the prime spot in the cabin all the while they have their very own camper
?? A-hem, what's wrong with this picture?
It does sound like a great time, despite some various hassles.