I believe one of the keys is understanding that parents are just human beings like you and me and everyone else. Some are further down the road in compassion, patience and giving than others. It may be interesting to know that many parents went through the same thing when they were young themselves, and later repeated the same things their own parents did to them upon their own kids. I found this to be abundantly true when I worked at a juvenile delinquency center. I asked twenty or so parole officers why are the kids there so violent, angry, disobedient, and disrespectful?
Every single parole officer said the exact same thing, "the parents" - meaning the parent's parents did the same to them when they were young. And what they ended up doing was marry young just to get out of the house themselves in order to escape their own abuse. The problem was that they had no proper parenting skills so when they went out into the real stressful world, they had no examples so they did what their parents did to them - abuse them. The answer to solving the problem begins with Love & Forgiveness. This breaks the cycle.
Hope this helps.