(a) Notice of mediation and of any hearing to be held pursuant to this chapter shall be given to the following persons:
(1) Where mediation is required to settle a contested issue of custody or visitation, to each party and to each party’s counsel of record.
(2) Where a stepparent or grandparent seeks visitation rights, to the stepparent or grandparent seeking visitation rights, to each parent of the child, and to each parent’s counsel of record.
(b) Notice shall be given by certified mail, return receipt requested, postage prepaid, to the last known address.
(c) Notice of mediation pursuant to Section 3188 shall state that all communications involving the mediator shall be kept confidential between the mediator and the disputing parties.