貴兄 is read as きけい (kikei) and means you.
きけい
kikei
あにき
elder brother
あにきぶん
(like) one's older brother
あにきかぜをふかす
to act patronizingly
たっとい
noble
きじん
aristocrat
きちょう
precious
きぞく
きちょうひん
valuable article
きしゃ
your company
あなた
you
きひん
noble visitor
ききんぞく
precious metal