堂兄弟

father's brother's sons / paternal male cousin

(main) hall / large room for a specific purpose / CL:間|间[jian1] / relationship between cousins etc on the paternal side of a family / of the same clan / classifier for classes, lectures etc / classifier for sets of furniture

older male patrilineal cousin

elder brother

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

younger brother / junior male / I (modest word in letter)

variant of 悌[ti4]