Question Summary:
Does divorce take place if a person commits adultery with his wife’s sister who is also married?

Question Detail:

If some sleeps with his wife's sister & that sister is also married with her husband .Are both husband & wife both side get divorce automatically by Islamic law . Because both have done adultery while they are married . Please let me know if possible.

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
If a married person commits adultery with his married sister in law (wife’s sister), then in an Islamic state the Qadhi (judge) will decree to stone them to death. [1] As such there is no question of divorce. [2]
Stoning to death cannot take place in a non-Muslim country, therefore by default the marriage will not be affected.
 If one is guilty of such heinous crimes, he/she should make tawba (repent) and reform himself. [3]
 
 
And Allah Ta’āla Knows Best
Ismail Dawoodjee
Student Darul Iftaa
Zambia
Checked and Approved by,
Mufti Ebrahim Desai.
www.daruliftaa.net 
 
 
[1] فان كان الزانى محصنا رجمه بالحجارة (قدورى ص265 سعيد) (بتغير يسير الاختيار ج3 ص466 الرسالة العالمية)
والا حد وهو للمحصن وطء بنكاح صحيح و هما بصفة الاحصان (الايضاح شرح الاصلاح ص8 ج2 علمية)
ساله عن الاحصان ما هو فان وصفه بشرائته حكم برجمه (تبين ج3 ص167 امدادية)
 
[2] وطئ أخت امرأته لا تحرم عليه امراته (در المختار ج3 ص34 سعيد)
و قوله لا تحرم أى لا تثبت حرمة المصاهرة(ردالمحتار ج3 ص34 سعيد)
رجل وطى اخت امراته لا تحرم عليهامراته(خلاصة الفتاوى ج2 ص7 رشدية)
و يحل لاصول الزانى و فروعه اصول المزنى بها و روعها(بحر ج3 ص101 سعيد)
فتاوى محمودية ج16 ص507 مكتبة محمودية
فتاوى دار العلوم زكريا ج3 ص590 زم زم
[3] التائب من الزنب كمن لا زنب له (ابن ماجة ص313 قديمي)