A guardianship case is required if you want to take care of a teenager or any other person who is incapacitated. A person who is not over 18 or who has been incapacitated will need a legal guardian. If you need to become a guardian of any person, you must go to court, and the court will make the decision for the person. If the ward is a child, he will have a guardian, but it does not always have to be the parent. For an adult, the guardian can be a friend, relative or parent. An adult should be given a guardian if he is not able to act on his own or make decisions for himself, or when he cannot communicate the decisions he wishes to make.