Where does “兄妹” come from?

兄妹 (Japanese) comes from Japanese 兄, from Old Japanese あに, from Japanese の, from Old Japanese の, from Middle Chinese 能 — talent, ability.

兄妹 (Japanese): elder brother and younger sister

Definitions

  1. elder brother and younger sister

Ancestry of “兄妹”, step by step

兄妹 traces back through two separate lines of ancestry.

via Japanese 兄

StepLanguageWordMeaning
1Japanese兄elder brother; elder brother-in-law; Short for...
2Old Japaneseあに—
3Japaneseのgenitive case marker; nominative case marker in a...
4Old Japaneseのplain, field
5Middle Chinese能talent, ability

via Japanese 妹

StepLanguageWordMeaning
1Japanese妹a close female companion; one's own younger...
2Japanese人a person, human; an individual; mankind, people
3Proto-Japonic*pitəone
Every word from Middle Chinese 能 →Every word from Old Japanese の →Every word from Japanese の →