戸籍係
こせきがかり family registration official

戸籍抄本
こせきしょうほん official copy of part of family register

戸籍法
こせきほう the Family Registration Law

戸籍調べ
こせきしらべ census-taking examining family registers

戸籍謄本
こせきとうほん official copy of the family register