___
--- Brothers
兄弟 kyōdai brother(s) 弟 [(younger) brother]  Ref. 兄 [(elder) brother]
兄 ani own elder brother   Ref. 兄 [(elder) brother]
お兄さん oniisan somebody's elder brother   Ref. 兄 [(elder) brother]
長兄 chōkei big brother   Ref. 兄 [(elder) brother]
弟 otōto own younger brother   Ref. 弟 [(younger) brother]
弟さん otōtosan somebody's younger brother   Ref. 弟 [(younger) brother]