Twenty Inch said:
Does it matter? If your Aunty was your Cousin's mum, then surely it has little to do with you?
Time for the Serenity Prayer, I think.
Doubt it since I'm Humanist.
You obviously haven't read the OP TwentyInch.
The cousin in the Army is the niece (well, step Niece if you want to get picky) of the deceased. Army cousin has never laid eyes on the deceased or had anything to do with rest of that side of the family. The cousin was not asked to wear military uniform by the deceased's daughter. IN fact, the deceased daughter hardly knew who she was. So,
IMO it was not etiquette.
It's complicated as there are a lot of family politics at play. Army cousin was basically sent by Army cousin's mother as a 'look at me' gesture, egged on I may add, by my old dear

and frankly used as a pawn. That's what I don't think was right.
Anyway, everything went off ok and I will be raising a glass to the departed tonight.
