姉弟

1. Origins, structure, and basic meaning

• Structure: 姉弟 is read してい and refers to an older sister and a younger brother together.
• Basic usage: In 姉弟の絆を描いた短編映画を見た。, the speaker watches a short film about the bond between an older sister and a younger brother.

2. Common pitfalls and similar expressions

• Gender and relative age
  • Within the broader category of siblings, 姉弟 specifies an older sister and younger brother. It carries both gender and relative-age information.