brothers; younger brother; CL:個|个[ge4]; I, me (humble term used by men in public speech); brotherly; fraternal

brothers and sisters; siblings

fraternity

brother(s) and sister(s)

elder brother; term of respect for a man of about the same age

brother (polite appellation for a friend one's age)

elder brother and his wife

internecine strife (idiom); fighting among oneself

internal disunity dissolves at the threat of an invasion from outside (idiom)