What I would do:
I would send a return note, which read "I am sorry that I cannot attend the 'No Norbydog Party' " (not my real name).
I would also come visit my cousin's grandmother the day before the party, kilted, with the most lavish and thoughtful gift I could find. And hope she spent the whole party talking about it.
P.S. A very similar event happened to me at my in-law's extended family home during Christmas two years ago. Now my wife, her parnets, and sister refuse to visit for the holidays.












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