The most common standard employed by courts in custody cases is the “best interest of the child” principle. This principle requires that courts do a careful balancing act in custody cases by taking into account the following: what the parents want, what the child involved wants, the relations among the child, the parents, the child’s siblings (if any), and others who are concerned with the child's best interests, the child's level of comfort in their current home, school, and community, and the mental and physical health of the persons involved.