弟 - younger brother, faithful service to elders

children; sons; children and younger brothers

biological younger brother

teacher and student

younger brother; little brother; kid brother

cousin (male)

younger brother and sister

brother-in-law (spouse's younger brother or younger sister's husband)

siblings; brothers and sisters

pupil; disciple; adherent; follower; apprentice; young person; teacher's student-helper

becoming a pupil (of); becoming an apprentice

younger brother of an Emperor

second cousin