also: きょうだい
noun
older brother and older sister
Formal or literary term referring collectively to one's older siblings. In everyday speech, お兄さんとお姉さん or 兄と姉 are more common.
彼は兄姉のいる家庭で育った。
He grew up in a household with older siblings.
兄姉の面倒を見るのは大変だ。
Taking care of older siblings is tough.
Gikun reading; the same kanji can be read as きょうだい, but this is uncommon and may be confused with 兄弟.
Compound of 兄 (older brother) and 姉 (older sister). The reading けいし is the on'yomi of the two characters.