(きょうだい)

きょうだい
noun
siblings, brothers
1. siblings, brothers and sisters
A general term for siblings, which can include both brothers and sisters.
兄弟(きょうだい)何人(なんにん)います
How many siblings do you have?
Common question about family
I have three siblings.
I went on a trip with my siblings.
Among my siblings, I'm the oldest.
I don't have any siblings, so I'm an only child.
2. brothers
More specifically, male siblings or brothers.
He has two brothers.
All the brothers play baseball together.
The twin brothers look very similar.
兄弟(きょうだい)げんかよくあることです
Fights between brothers are common.
Those two get along like real brothers.

兄弟(きょうだい) is written with the kanji for 'older brother' and 'younger brother,' but in modern usage, it typically refers to siblings in general, regardless of gender. When asking about siblings, Japanese people often use 兄弟(きょうだい)何人(なんにん)います or ご兄弟(きょうだい). For sisters specifically, you can say 姉妹(しまい).