What is the ruling on living with a sister who practices sorcery in the same house?

It is obligatory to advise the soothsayer who claims knowledge of the Unseen and to establish the proof against him with Shar'i (Islamic legal) evidences indicating the prohibition of consulting soothsayers. One must avoid mixing with soothsayers except for a necessity that is estimated by its measure, with the obligation to repeat the advice whenever the opportunity arises.