Supplementary Provisions, Article 26
第二十六条
If the head of a household at the time the Emergency Measures Act came into effect is a person who entered from another house through marriage or adoption, the stepchild attached to that house has, with respect to a succession that opens after the New Act comes into effect, the same rights and duties as a child in wedlock.
応急措置法施行の際における戸主が婚姻又は養子縁組によつて他家から入つた者である場合には、その家の家附の継子は、新法施行後に開始する相続に関しては、嫡出である子と同一の権利義務を有する。
If succession has opened, after the Emergency Measures Act came into effect and before the New Act came into effect, with respect to the person who was the head of the household referred to in the preceding paragraph, the stepchild referred to in the preceding paragraph may demand that the heirs distribute part of the estate. In this case, the provisions of Article 27, paragraphs (2) and (3) of these Supplementary Provisions apply mutatis mutandis.
The provisions of the preceding two paragraphs do not apply if the person who was the head of the household referred to in paragraph (1) has changed surname after the Emergency Measures Act came into effect through the cancellation of a marriage or divorce, or the annulment of an adoption or dissolution of the adoptive relationship.