If the Father-in-law Commits Adultery with his Daughter-in-law, what is the Ruling about it?
If someone saw his father committing adultery with his wife, his wife became forbidden to him without divorce. In addition, if the person divorced his wife, then after the divorce, she was primarily excluded from his marriage. Now in any case that woman will not be permissible for them.
As long as the adulterers do not publicly repent, Muslims should not have any relationship with them.