Students under 18 years
Usually, International students studying in Australia on a student visa will require a guardian if they are under 18 years of age. These arrangements need to be in place before an application for a student visa can be lodged. One of the options for guardianship is for the student to be accompanied to Australia by a parent or a person who has custody of the student. This person must apply for a Student Guardian Visa. This visa allows guardian to stay in Australia for the same length of time as the student or until the student turns 18.
For more information, visit: http://www.immi.gov.au/students/student_guardians/