Oh, and a big mistake I see many parents make... one has to stick with what they said. If the child didn't do as they were told... you don't just give them the iPad anyway. As a matter of fact I wouldn't let them play with it for the whole day. One needs to reinforce "I mean what I say, and you will obey".
Yeah that's one of the few constants we've found with good parents vs bad parents. Consistency is key. When we take away something, we make sure there is no going back on it or going to the other parent about it.