Just a counterpoint...
Quote:
Everyone thought they were middle of the day...
I was supposed to tell middle sister ...
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So the first bits I read are that you guys 'assumed' and forgot to tell her about this. Then planned a suprise party at the same time as the tickets she bought for Mom's birthday. Could her perspective be that you guys are unreasonable to ask her to cover for your mistake?
Now I agree that even if YOU were wrong she should take one for the team so everyone could attend....
Mind you this does not take history into account and this is a limited microcosm, but I got this out of what I read.