You can make firm rules regarding watching television. These would remind them that their are certain shows or music which are not appropriate to their age and let them be aware of this. With regards to this, you would also set punishment to them if someone disobeyed. To lessen the irritability, it is often better to state rules and expectations verbally in a clear and simple fashion.
Another you can opt to is – as early as possible it is a good thing that you should integrate religious values to your child by simply letting them ask for forgiveness by praying for every simple lies and misbehave that they does, let them say sorry as well and let them join programs for troubled kids.