I personally don't like leaving kids unattended in vehicles but I can also see the issue with loading and unloading multiple children. I think the best would be if you could "hire" a student to walk your son to the van or if you and the other moms could work something out. Maybe one mom could stand watch over hers and your vehicle while you get your son and than you do the same so she can get her child. This would also allow you to talk to the teacher if need be.

In regard to the husband watching dc children, I fail to see why this is a problem? Many daycare providers have a backup provider. It's a benefit to the parents because it eliminates some of the closures that may need to happen if a backup is not an option. Mine is an amazing backup....he works evenings so it works out great! The kids and parents love him