His only sibling is his little brother, Sasuke Uchiha.
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No, Itachi was never shown smoking.
actually, sasuke didn't kill itachi. when they fought itachi was hurt or sick, and he died. he never intended on killing sasuke. sasuke didn't know about itachi's past
Itachi Uchiha part of the Uchiha clan also a member of the akatsuki
Obito mentioned that Itachi had a lover which he killed during the massacre. Other then that nothing is known about Itachi's love life.
yes his brother's name is Uchiha Sasuke and Sasuke's brother's name is Uchiha Itachi == ==