A mediator selected to conduct a mediation under this chapter may encourage and assist the parties in reaching a resolution of their dispute, but may not compel or coerce the parties into entering into a settlement agreement. A mediator has an obligation to remain impartial and free from conflicts of interest in each case, and to decline to participate further in a case should such partiality or conflict arise. Unless expressly authorized by the disclosing party, the mediator may not disclose to either party information relating to the subject matter of the mediation provided to him in confidence by the other. A mediator shall not disclose information exchanged or observations regarding the conduct and demeanor of the parties and their counsel during the mediation, unless the parties otherwise agree. However, where the dispute involves the support of minor children of the parties, the parties shall disclose to each other and to the mediator the information to be used in completing the child support guidelines worksheet required by § 20-108.2. The guidelines computations and any reasons for deviation shall be incorporated in any written agreement by the parties.