Brother-In-Law & Sister-In-Law

Rasulullah SAW said:

"The brother-in-law is death (to the sister-in-law)."

In view of the above Hadith mentioned, a person should exercise strict Hijab with his / her
sister-in-law / brother-in-law. Do not look at them or talk to them unnecessarily.

In most cultures of the world, it is commonly accepted that the brother-in-law and sister-in-law are like brothers and sisters. This is a misconception and does not make the rulings in shari'ah. The brother-in-law to the sister-in-law is a non-Muhrim; and vice-versa.