Legal Question in Family Law in California

I'm surprised at this question. Normally when the parties attend mediation, the mediator has the parties sign a confidentiality acknowledgement. This usually includes a statement that the mediator cannot be called as a witness, because statements made in mediation are confidential and are not admissible as evidence.

A mediator is incompetent to testify in any subsequent civil proceeding as to statements made or matters occurring at or in conjunction with the mediation. (Evid. Code, sect. 703.5.)