Article 877, paragraph (1)
Lineal blood relatives and siblings have a duty to support one another.
直系血族及び兄弟姉妹は、互いに扶養をする義務がある。
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民法
Chapter VII Support
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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Chapter VII Support第七章 扶養
Article 877第八百七十七条
Persons under a Duty to Support One Another（扶養義務者）
Article 877, paragraph (2)
If there are special circumstances, the family court may also impose a duty of support between relatives of up to the third degree, beyond what is prescribed in the preceding paragraph.
家庭裁判所は、特別の事情があるときは、前項に規定する場合のほか、三親等内の親族間においても扶養の義務を負わせることができる。
Article 877, paragraph (3)
If an alteration in circumstances arises after a ruling under the provisions of the preceding paragraph is issued, the family court may revoke that ruling.
前項の規定による審判があった後事情に変更を生じたときは、家庭裁判所は、その審判を取り消すことができる。
Article 878第八百七十八条
Order in Which Persons Support a Relative（扶養の順位）
Article 878, paragraph (1)
In the event that several persons are under a duty to support a relative, if no agreement between the parties is reached with respect to the order in which they will support that relative or if discussions toward such an agreement cannot be held, the family court determines that order. The same applies if there are several persons entitled to receive such support and the financial capacity of the person under a duty to support them is insufficient to support them all.
扶養をする義務のある者が数人ある場合において、扶養をすべき者の順序について、当事者間に協議が調わないとき、又は協議をすることができないときは、家庭裁判所が、これを定める。扶養を受ける権利のある者が数人ある場合において、扶養義務者の資力がその全員を扶養するのに足りないときの扶養を受けるべき者の順序についても、同様とする。
Article 879第八百七十九条
Extent and Form of Support（扶養の程度又は方法）
Article 879, paragraph (1)
If no agreement between the parties is reached with respect to the extent and form of support or if discussions toward such an agreement cannot be held, the family court determines this in consideration of the needs of the person entitled to support, the financial capacity of the person under a duty to give support, and all other circumstances.
扶養の程度又は方法について、当事者間に協議が調わないとき、又は協議をすることができないときは、扶養権利者の需要、扶養義務者の資力その他一切の事情を考慮して、家庭裁判所が、これを定める。
Article 880第八百八十条
Alteration or Revocation of an Agreement or Ruling with Regard to Support（扶養に関する協議又は審判の変更又は取消し）
Article 880, paragraph (1)
If an alteration in circumstances arises after an agreement or ruling on the order in which persons are under a duty to support a relative, the order in which persons are entitled to receive support, or the extent or form of support, the family court may alter or revoke the agreement or ruling.
扶養をすべき者若しくは扶養を受けるべき者の順序又は扶養の程度若しくは方法について協議又は審判があった後事情に変更を生じたときは、家庭裁判所は、その協議又は審判の変更又は取消しをすることができる。
Article 881第八百八十一条
Prohibition on Disposal of the Right to Claim Support（扶養請求権の処分の禁止）
Article 881, paragraph (1)
The right to receive support may not be disposed of.
扶養を受ける権利は、処分することができない。