In case of marriage that husband will be a member of a family which has female head of a family (Nyufu marriage), if no party dissent, a husband became a head of a family (the Old Civil Codes, Article 736).
婚姻により夫が女戸主の家に入る（入夫婚姻）際、当事者の反対意志表示が無い限り入夫が戸主となった（旧民法736条）。