Sometimes we forget that we don't need to let kids be whiny, grumpy, or rubbing their eyes and showing us they are tired because by the time they are doing that they are overtired. I would just assume that they are really ready/able to fall asleep earlier in the morning and put then down at 9:30 instead of 10 and then not let them sleep past 11:30 as in 1 1/2 hours in the morning. Then you should be able to move the afternoon nap at least to 2-4 instead of 3-5. Given the schedule of the kids for pickup/supper sleeping till 4 is probably a good thing and then it is another 4 hours till bedtime.