sibling
US
UK sibling n: (brother, sister)
SC 兄弟 xiōng dì
TC 兄弟
TC 兄弟
SC 姊妹 xiōng dì ，zǐ mèi
TC 姊妹
TC 姊妹
Natalie has three siblings: two brothers and a sister. I only have one sibling: a brother.
娜塔莉有三个兄弟姐妹，两个哥哥和一个妹妹。我就只有一个弟弟。
sibling n as adj: (relating to brothers or sisters)
SC 手足的
SC 兄弟的，姊妹的，兄弟姐妹的 xiōng dì de
There is often a certain amount of sibling rivalry between brothers and sisters.
通常兄弟姐妹间都会存在一定程度的手足竞争。