Background to situation.
SIL only has one brother who lives miles and miles away but he and his wife and 2 kids visit often, about once a month, combining it with a trip to his parents for the weekend as they live nearby.
my nephew's birthday was last week but the birthday party is organised for this Saturday because SIL's brother +wife and kids couldn't make it on the weekend of the birthday.
My parents are quite busy people for retired types but naturally blocked out the birthday weekend in their diary almost as far back as January. They took the news that the party was being delayed for SIL's brother's benefit well and apologised that they had a serious prior commitment that day which meant they wouldn't be able to attend the actual party. All was fine, no-one felt put-out or offended.
Now SIL's brother has apparently said that one of his kids has been invited to a friends party and they don't want to refuse for some reason, so none of them will be coming down to the party which was delayed for their own benefit to start with. Other people are invited which means the party date simply can't be changed again for their benefit.
I was brought to understand that once you've accepted an invite you don't throw it over if you get a better offer, let alone if the original party has already been delayed specifically so that you can attend it.
My mother is annoyed but being a tactful MIL she is keeping her thoughts to herself at the moment but does anyone else think this is spectacularly rude behaviour by these people. (I have met them several times and they seem polite and keen on manners etc) They live in a world of housekeepers, expensive handbags and second homes but it appears that money can't buy you good manners. Or is it just that some people are more important than others after all ?