The Flopper . . .

[gcj]

I would talk to dad when the child is not there and say that at 3 she is perfectly capable of undressing herself. If she won't allow him to help her appropriately , she will lose that privillege and he must drop her off, say goodbye and LEAVE. It's interfering with your daycare and allowing behaviour in your house that you don't approve of.
how annoying! Good luck!