In addition to the appointment of an attorney, the court may appoint a GAL to protect the best interests of a minor or an individual who may be incompetent or in need of protection, or as the court otherwise directs. A GAL appointed under this rule must be an attorney. When the court appoints a GAL, the court must clearly define the purpose and scope of the appointment, the GAL's role in contested proceedings, including disclosure and discovery proceedings, and the court's expectation of the GAL's role in the case. The court must order the parties to disclose all relevant information to the GAL. A GAL is not bound by the expressed preferences of the minor, the individual who is incompetent, or the protected person.