(1)  The following persons are parties to an application for an assessment order or a care and protection order:

(a) the Secretary;

(b) the child the subject of the application;

(c) each guardian of the child.

(2)  If an application to vary, extend or revoke an assessment order, a care and protection order or an interim care and protection order is made, all persons who were parties to that order and all persons who are bound by that order are parties to the application.