형제와 자매

brothers and sisters – 兄弟와 姊妹 [hyeongchewa chamae]

Etymology

兄 (오빠 for sister, 형 for brother) – older brother;
弟 (남동생) – younger brother;
姊 (언니 for sister, 누나 for brother) for older sister;
妹 (여동생) – younger sister;