Code of Civil Procedure Article 62

Article 56 shall apply mutatis mutandis to all cases where the claims of an action must be adjudicated jointly with regard to the intervener and the party supported.
中文原文 民事訴訟法第62條
訴訟標的,對於參加人及其所輔助之當事人必須合一確定者,準用第五十六條之規定。

English translation for reference only; the Chinese text prevails. Not legal advice.