Assalamwalaikum, Its been 5 years now for our marriage and from the last four years Myself and My Wife had differences and during this I fell in love with my sister in law and we both love each other and my sister in law also cannot live without me. When myself and Wife were on the verge of getting separated, I told my wife about my intentions of getting married to her sister.. But the moment I said her about separation, she realised her mistakes and became good.. Now our family and My wife all are aware of our affair.. Because of Changes in my wife I am struck with the Islamic bondings and our family members wants me to continue my marriage.. I am not sure whether I can keep my wife happy and also afraid if my sister in law gets married to other person she will also be in a mess and cannot keep her husband happy.. Please suggest in this situation can I marry both the sisters? or Otherwise what to do?
You can never marry your sister in law keeping your wife in nikah, it is invalid and haram. Also, it is major and haram to have intimate relations, openness and seclusion with her. You should immediately severe your relations with her and repent to Allah sincerely. Stay careful in future and keep on fulfilling the right of wife fully. You were deceived by the nafs and Satan that severance of relation with her and her valid Nikah will create troubles for her. The only way to protect for both of you is to pay attention to rectify yourselves.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband