...I don't particularly want to pick a fight.
Their dd was born 4 months ago. Yesterday, totally out of the blue, she rang to say they have booked her naming ceremony which will take place in July. When we are on holiday, a holiday which we booked 6 months ago. And which, although I don't expect her to know the exact details of, I did discuss with her two weeks ago when she asked if we were going away. So she should at least have had a vague memory of the fact we might not be around even if common sense hadn't suggested people do often go away during July.
When I said that we would be away (apologetically - I don't want to miss it) she said breezily that it would be easy to change and this was more important. We really can't change it - villa in South of France with two sets of friends, TGV booked etc. I explained this and she got very snippy. Apparently her best friend who lives in Scotland can ONLY come down that weekend and we are being totally unreasonable and should just cancel the holiday.
I haven't dared mention to her that I know my parents are also away that weekend at my dad's oldest friend's 70th birthday. She has gone ahead and made all the bookings without ever thinking that we may have other plans...
So, she's furious with us, and thinks we are being selfish. I think she's being silly and should try and rearrange the ceremony if having us all there is as important as she claims. As I say I am sorry we won't be there but am not prepared to cancel a week's holiday that was booked and paid for before she even had the baby.