Thanks for the suggestions. I'm not so worried about switching the one that naps twice but the one 18 month old whose nap usually doesn't start till 1 is the one that frightens me. She is loud when she's not tired and my places to put her are limited. I guess I"ll just start moving the naptime up a bit each time she comes (which is only 3 days/week).

Thankfully I already have a video monitor so I can watch the two rooms. 2:30 is definitely not overly convenient. I have another family who can pick up twice a week if needed but it's not overly reliable. I guess its time to get down to business and seeing as school probably won't start on schedule I have some extra leeway time.