兄弟

1. Origins, structure, and basic meaning

• Structure: The kinship noun 兄弟 (きょうだい) can refer to siblings regardless of sex.
• Basic usage: Shared action uses 兄弟で, while family size is expressed as 三人兄弟.

2. Common pitfalls and similar expressions

• Siblings without an automatic male-only limit
  • In Japanese it can include sisters as well as brothers, so the translation should not be fixed to male siblings only.