In a very perfect world....
It should be completely irrelevant which house any given child is staying at during a time when there is any given event.
In a perfect world, the parent that goes with the house would be taking said child to event, would be involved the same as the parent who lives at the other house, would have to deal with what to do with the other two kids during an event for one kid......
DISTANCE should not be a factor, your husband CHOSE to live the distance away from his kids, THEY did not have that choice.
Your husband is learning that a LARGE CHUNK OF HIS RELATIONSHIP WITH HIS CHILDREN HAS BEEN FOSTERED BY THEIR MOTHER FOR ALL THOSE YEARS, and NOW, if he wants his OWN relationship with each individual child, he will NEED TO FOSTER IT HIMSELF!
Also, at 13, you daughter (emotionally AND legally) can decide for HERSELF what kind of relationship she wants with her father, whatever she decides, it IS NOT YOUR FAULT. HE has the option of developing his OWN life with his kids.
Sorry, Am I yelling? Sigh.
We too, technically have the same plan as yours. Supposed to be every other weekend, Friday night to Sunday night. My kids spend maybe one Saturday night a week at their father's house. He just wants to 'hang' with them. He does not want to bring them where they need to be, be involved in their activities.......and frankly, it's worked out for us, because they would WAY rather I still did it all, you know?
Sorry, you're goin' through this.
:(