My name is ***** ***** I have been a family lawyer for more than 30 years
Just to add to the above.
It is for both parents to agree how the children share their time between them - and it is helpful if they can agree a Parenting Plan.
However it is important then to respect the timings that have been agreed and not to "decide" to do something else when that time comes.
Neither parent did well on this occasion
Instead of "informing" Dad should have asked and made sure that the child understood that it was up to Mum whether the time was extended or not.
Equally mum could have been a little more flexible - but no doubt she was angry at the way it was approached.
Family Mediation is certainly the best way forward as a Court Order is even less flexible than the current arrangements.
They can both read more on this site