"Learn to write your hurts in the sand and to carve your blessings in stone."
It probably wouldn't take any one us but a moment to think of one (or many more times) in which you felt offended by the actions of others. This is very true of marriage and raising children, and too often we tend to hold grudges and treat the postal carrier or the guy handling your order at McDonalds with more courtesy and respect than are own family.
In life, things happen, and mistakes are made. What we do next will often determine the outcome. Generally speaking, we often take several possible approaches, two of which are (1) holding the offense against someone because they somehow deserve it, and/or (2) we won't let the issue die until the person comes grovelling to us (i.e., we appoint ourselves judge over the situation).
Developing the skill to allow your hurts to be washed away requires very open communication, something with which I still need plenty of practice. However, harboring bitter feelings toward a spouse or children does nothing to foster positive feelings at home.