noun
siblings; brothers and sisters
General term for one's own siblings or siblings in general. Can refer to any combination of brothers and sisters. Often used with honorific prefix ご when referring to others' siblings.
See also: ご兄弟
私は兄弟が三人います。
I have three siblings.
ご兄弟は何人ですか。
How many siblings do you have?
noun
half-siblings; step-siblings; siblings by marriage or adoption
Used when the sibling relationship is not by blood, such as half-siblings, step-siblings, or adopted siblings. Context usually clarifies the exact relationship.
彼は血の繋がらない兄弟と一緒に育った。
He grew up with step-siblings.
noun
Familiar, casual term used mainly by males to address close friends or peers. Similar to 'bro' or 'mate' in English. Not used toward women or in formal situations.
おい、兄弟、元気か?
Hey, mate, how's it going?