FIL/BIL - Mehram or not?

Re: Working Women - the Islamic Perspective

Saali/bhenoi and devar/jheeth/bhabhi are non mehrams for each other. the criteria put by Islam for mehram and non mehram is based on as Mehram= someone you can not marry in any case whether before marriage or after the divorce/passing away of your spouse.
Non-Mehram= someone you can marry and someone you can marry later after the divorce/passing away of your spouse.
so BILs and SILs are not mehram.