I wonder why he married a woman he thinks isn't up to the job of caring for his children...strange man.

She knows that your daughter and her dad disagree and is using it to create problems between them. Your daughter and her dad need to compromise, somewhere in the middle is a set of standards they can both live with. If he won't your daughter should point out to him that if he's not happy with her ways of coping with the kids then maybe he should look after them himself. Tell her to start saying NO! (Been there, done that and understand the stress it causes!)

Wow, he sounds like a great father. Maybe there is something she can learn from him. After all he is the one with experience and they behave well with him.

Sorry, I just had to point that out. I don't mean that your daughter couldn't have some good idea, but parenting is experience and learning.