What is the ruling on the father's wife remaining in the home after committing adultery with a relative?

Adultery is a grave sin and an abomination. Accusing chaste women of it without four witnesses necessitates eighty lashes, rejection of testimony, and designation as a fasiq (transgressor). You must advise the woman and warn her of Allah's punishment, and advise your relative to cease the relationship. Do not contemplate suicide, for one who kills oneself deserves punishment. And do not kill the woman or the man, lest you become subject to retribution (qisas).