17.兄弟姊妹--Sibling

兄--xiong
ㄒㄩㄥ
elder brother
a common address from one man to another in more-or-less the same generation

弟--di
ㄉㄧˋ
a younger brother
[Formal] a reference to oneself in correspondence nearly used by all males

姊--jie
ㄐㄧㄝˇ
an older sister

妹--mei
ㄇㄟˋ
a younger sister

兄弟姊妹--Sibling