(a) Filing. Any appellee, including the Guardian ad Litem, may file a response to the petition on appeal with the appellate clerk within 15 days after service of the appellant's petition on appeal. Filing of the petition must be in accordance with Rule 21(a). The response must be accompanied by proof of service to counsel of record of each party, including the Guardian ad Litem, or, on the party if the party is not represented by counsel. The response will be deemed filed on the date of the postmark if first-class mail is utilized.
(b) Format. A response must substantially comply with the Response to Petition on Appeal form that accompanies these rules. The response may not exceed 5,000 words, excluding any attachments, and must comply with Rule 27.