That really make a difference 
Ex won't deviate from his hard fought EOW contact, no flexibility, no swaps, nothing. Even if it means that he misses out on spending his own birthday, fathers day etc with the kids.
Which obviously means that they've had to miss out on some important family events.
Step MIL has a significant birthday coming up which falls on one of the weekends when the kids are with their dad. My step sis and family are all travling quite a distance for a whole weekend of family celebrations and I'd resigned myself to the fact that my kids would miss out.
But step sis has just emailed to say that they are bringing the celebrations forward a full week just to make sure that my kids are included 