Disciplining children is one thing that parents have to do. Sometimes your children would go out of line and you need to teach them how to be appropriate. Children are bratty when they're young. You can learn to teach them how to be appropriate when they are younger because it'll be more difficult to teach them as they get older.
Training your children when they're young is the best. Everything must start out when they're young. If you leave it until they've formed a habit then it'll be hard for you to to try to shape them. People learn their habits best when they're young.
People do things a certain ways because they learned it when they were younger. Whatever that people learn when they were young will be permanent when they're old. Memories and past experience are what shape people when they're older. You should take advantage of when they're young and teach them what you want.
When your children is about 5 or when they learn how to talk you can start training them. Training can take forms as communication or physical training. You should know that the brain remembers and do what they are exposed to.
Therefore you can expose the mind to habits that it will remember when they're older. Have you ever watch Pavlov dog training video. Even dogs get use to what their owner train them to do. The same is with children. They will learn what you train them. Therefore train them in a way that they can benefit later on in their life.
Some parents have children that are so out of control and they have no idea what to do with them. They probably didn't invest much training into them when they were younger. How about when your boys yells really loud at you as you tried to speak to them.
They have overpowered you and there's not much you can do about it. Some even get more loud. It's frustrating when your children behave this way. It's not your fault but it happens. Parenting is one of the most difficult thing that there is out there. It's to your best advantage to shape and mold your kids when they're young and still want to listen. It can be too late one day.