Article 725, paragraph (1)
The following persons are relatives:
次に掲げる者は、親族とする。
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民法
Chapter I General Provisions
The law as Act Partially Amending the Civil Code, etc. (Act No. 45 of 2026) leaves it, with the words it changes marked.
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Part IV Relatives第四編 親族
Chapter I General Provisions第一章 総則
Article 725第七百二十五条
Range of Relatives（親族の範囲）
Article 725, paragraph (1), item (i)
blood relatives of up to the sixth degree;
六親等内の血族
Article 725, paragraph (1), item (ii)
spouses; and
配偶者
Article 725, paragraph (1), item (iii)
relatives by affinity of up to the third degree.
三親等内の姻族
Article 726第七百二十六条
Determining Degrees of Kinship（親等の計算）
Article 726, paragraph (1)
The degree of kinship between two relatives is determined by counting the number of generations between them.
親等は、親族間の世代数を数えて、これを定める。
Article 726, paragraph (2)
The degree of kinship between collateral relatives is determined by the number of generations between a person or that person's spouse and the common ancestor shared with another person, plus the number of generations back down to that other person.
傍系親族の親等を定めるには、その一人又はその配偶者から同一の祖先にさかのぼり、その祖先から他の一人に下るまでの世代数による。
Article 727第七百二十七条
Kinship through Adoption（縁組による親族関係の発生）
Article 727, paragraph (1)
From the time of adoption, the kinship between the adopted child and the adoptive parent (and the blood relatives of the adoptive parent) is the same as that of blood relatives.
養子と養親及びその血族との間においては、養子縁組の日から、血族間におけるのと同一の親族関係を生ずる。
Article 728第七百二十八条
Termination of Relationships of Affinity upon Divorce（離婚等による姻族関係の終了）
Article 728, paragraph (1)
Relationships of affinity are terminated by divorce.
姻族関係は、離婚によって終了する。
Article 728, paragraph (2)
The preceding paragraph also applies if one party to a marriage dies and the surviving spouse manifests the intention to terminate the relationships of affinity.
夫婦の一方が死亡した場合において、生存配偶者が姻族関係を終了させる意思を表示したときも、前項と同様とする。
Article 729第七百二十九条
Termination of Kinship upon Dissolution of Adoptive Relationship（離縁による親族関係の終了）
Article 729, paragraph (1)
The kinship of an adopted child and the spouse thereof, as well as the kinship of the adopted child's lineal descendants and their spouses, to the adoptive parent and the blood relatives thereof, is terminated by the dissolution of the adoptive relationship.
養子及びその配偶者並びに養子の直系卑属及びその配偶者と養親及びその血族との親族関係は、離縁によって終了する。
Article 730第七百三十条
Help Among Relatives（親族間の扶け合い）
Article 730, paragraph (1)
Lineal blood relatives and cohabiting relatives must act so as to help one another.
直系血族及び同居の親族は、互いに扶け合わなければならない。