Oh, they are 6, and the schedule deal. Well, what about a 4 and 3 schedule for a while? Yes, it screws up weekendsbut it is more predictable. Also when they get into school life will be better, because more organized.
So you are having 4 custody exchanges per month. I would STRONGLY recommend if you and your children's father can do this with good heart, to do at least one custody exchange that involves a family meal. We did: after church brunch, which worked very well, then we did, before school breakfast (at a local diner, our waitress was practically our therapist) and we have done the after-school-before-sports-better-eat-another-sandwich-didja-bring-smore-napkins meal.
YOu are probably on the way to do back-to-school shopping. To hell with the budget, buy two of everything, one for one house, one for the other. This schlepping stuff is hard on kids!