Enforcement Rules for the Act Governing Relations between Peoples of the Taiwan Area and the Mainland Area Article 58

The father or mother as referred to in Article 57 of the Act shall not include stepfather or stepmother.
中文原文 臺灣地區與大陸地區人民關係條例施行細則第58條
本條例第五十七條所稱父或母,不包括繼父或繼母在內。

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