Often new children are the cause of misbehaviour and it is because they do not know the rules. This rule is seen in practise when one person speaks at a time, or when hands are raised to answer questions. There are several reasons for immaturity. The child may be chronologically younger and if a boy, who mature later than girls, the problem is compounded. The reason may be emotional.
Parents often treat their children in such a way that their emotional development is stifled.
There may be mental reasons for the immaturity if the child has a lower intelligence. If it is out of retaliation the child will detect this and any relationship that may develop will be destroyed. Show a willingness to walk alongside the child to overcome the behaviour.