Does your Dad know about these changes yet?
OP here. Dad was out of town when all of this happened.
When he got home he got very
upset. We had rented a cabin in a state park. This park has about 25 cabins. The whole group had rented 3 cabins, ours was right next to another and the third was a few cabins over, but was less appealing (no deck, bad view). Dad insisted on changing to a cabin a bit away so that we were right on the water (though I think the main reason was because it isn't next to grandma, who we/he don't much get along with).
We told the others and the family in the less appealing cabin moved to a more appealing cabin. Now all 3 cabins are spread out. They are within a 5 minute walk of the "middle cabin", but we can't see each other at all. The family that moved seems much happier now too. It seems they had kept that cabin because they didn't want to hurt any feelings by moving further out.
Sister is coming again, and her BF is planing to come for a weekend only. He will be on an air mattress. Once SpecialSnowflakeAunt heard of this she tried to join us for the rest of the week. I told Mom I wouldn't come if she was invited to stay with us. I feel a little guilty about issuing an ultimatum, but I do not get along with SSAunt. Mom agreed because, though she fakes it well, she apparently doesn't get along with SSAunt either.
So SSAunt has the option to stay with grandma and WildChildAunt. I expect SSAunt to back out of the trip all together because she can't stand WildChildAunt.
Mom has agreed that we can pick at least one day and limit it to "family only activities". And that we can have some "family only" things during the week.
In short...mom mostly got her way (as usual), but she met enough resistance that we're all ok with the outcome.
As a side note, I learned later that she had tried to rent us a lodge that basically had a bunk hall. One of my uncles put a stop to that. Thank you uncle!