Code of Civil Procedure Article 412
A third person having an interest in the subject matter of the mediation may, with the permission of the judge, intervene in the mediation proceeding. The judge may notify the third party of the mediation proceeding and order him/her to intervene.
中文原文 民事訴訟法第412條
就調解事件有利害關係之第三人，經法官之許可，得參加調解程序；法官並得將事件通知之，命其參加。