Yes, there are times when I get resentful with the children, especially when they act like they don't care about my and my wife's feelings. It's like we do everything for them but we don't get anything in return, not even appreciation.
Normally, when I start to feel any sign of resentment, I talk to my wife about it, and we talk to the kids (or to a specific child, when the situation calls for it) and try to come up with a win-win solution.