It is common for children and teenagers to display bouts of irritability, frustration, and disobedience over the course of their growth and development. For example, the 4 year old who throws a tantrum because she has to stop playing; the 8 year old who picks on his younger sister; the 13 year old who argues with her mother about going to a movie. Still, there are many families who struggle with child behavior that goes beyond stubbornness or occasional talking back.