How do you deal with parenting styles?

[KellyP]

I wouldn't deal with the behavior. Period. If she can't behave and is whiney and cranky due to lack of sleep, I would call the parents and let them know she is not prepared to be in care today.

Their lack of parenting skills does NOT mean you have to deal with the fallout while they go merrily off to work not at all stressing about it.

The problem belongs to the parents. Give it back to them.