The petition for certification and all subsequent court documents shall be entitled "In the interest of ..., a child." The petition for certification shall state:
(1) The petitioner's relationship to the child;
(2) The child's name, age, address and present location;
(3) The name and address of the child's parents or legal guardian or other person exercising custodial control or supervision;
(4) The name and address of the person having custody of the child;
(5) The name and address of the child's spouse, if any;
(6) The petitioner's belief, including its factual basis, that the child is mentally ill and is dangerous to himself or others; and (7) The petitioner's belief, including its factual basis, that the child can benefit from treatment available only at a hospital and that no less restrictive alternative is available which will be effective in treating the child.