I am still so angry at my dad

It has been a challenging week at home. I had to deal with a few things and my dad has not been the most helpful person. He was not exactly helpful, but he tries his best to be. And I could not help to be angry at him. Then I realized that these things are happening, because its a lesson for me to let go of my anger towards him. It is human nature to be upset about these things, but I stayed angry for a while about these little things. Then I reflected some more, and noticed that I just wanted to stay angry about my dad. If anyone else did the same thing, I would be upset for a minute and move on. Are there times, when you just want to stay angry at someone close to you, not because of what they did, but because of who they are? It is time to let anger go. And move on to your happy life instead.