eldest

長男

Refers to the male child in a family who was born first.

最初に生まれた、または最も年上の息子

一番上の子

Refers to the child in a family who was born first, regardless of gender.

性別に関係なく、家族の中で最初に生まれた子供を指します。

Refers to the female child in a family who was born first.

Refers to the male child in a family who was born first.

一番年上の兄弟姉妹

Refers to the one among brothers and sisters who was born first.

家族の中で一番年上の兄弟姉妹を指します。