This suggests that both environment and biological family history can influence a child's likelihood of future drug use.

CNN: SHARE THIS

Knowing that a child was susceptible to middle ear infections because of a family history of the condition would allow parents to control the child's environment, reducing its chances of becoming ill, he said.

BBC: Ear examination

Your child's doctor or mental health provider will also look for other possible causes for your child's behavior, such as a history of medical conditions or trauma.

CNN: Mental illness in children: Know the signs