Adolescence is an age when children tend to show egocentric behavior meaning that they feel whatever they are doing ir saying is valid as well as sometimes they disrespect authority too. The first thing we need to do is understand whom the child considers to be close to him and shares all his feelings with which will help us in understanding if there is anything bothering the child.
Next Steps
Behavior of child should be noted down i.e on what things is the child showing these tantrum and when ?
Health Tips
Make sure to not fulfill all the demands of the child and start with a reinforcement system wherein if the child does something good, he should be rewarded for it and counselling should be done to understand his concerns with the mother.