Each of the following persons is an
"active party" for a proceeding in relation to an adult—
(a) the adult;
(b) if the adult is not the applicant—the applicant;
(c) if the proceeding is for the appointment or reappointment of a guardian, administrator or attorney for the adult—the person proposed for appointment or reappointment;
(d) any current guardian, administrator or attorney for the adult;
(e) the public guardian;
(f) the public trustee;
(g) a person joined as a party to the proceeding by the tribunal.