Meanings

younger brother and sister

apprentice

private pupil

second cousin

indirect pupil

disciple

your younger brother

younger brother

pupil

younger daughters

younger sons

younger brother's wife

youngest brother

younger pupil (of the same master)

younger pupil (of the same master)

both people are superb in skill (and thus it is hard to rank them)

disciples of one's disciples

biological younger brother

an apprentice system

parents and siblings