The February 28 Incident Disposition and Compensation Act Article 13

A “family member” of a victim mentioned in this Act refers to an heir of a deceased or disappeared victim in accordance with and in the order as specified in Article 1138 of the Civil Code.
中文原文 二二八事件處理及賠償條例第13條
本條例所稱受難者家屬,係指已死亡或失蹤之受難者,其依民法第一千一百三十八條規定順序之法定繼承人。

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