Act Governing the Choice of Law in Civil Matters Involving Foreign Elements Article 52

Where the natural father and natural mother of a child born out of wedlock become married, the status of the child is governed by the law applicable to the effect of the marriage.
中文原文 涉外民事法律適用法第52條
非婚生子女之生父與生母結婚者,其身分依生父與生母婚姻之效力所應適用之法律。

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