The Arabic word mahram is defined as a person with whom marriage is permanently forbidden. There are three general categories:
- Blood relative mahram
- In-law mahram (MIL, FIL, stepfather-in-law, stepmother-in-law)
- Fostering mahram
These are people who are permanently forbidden for you to marry, even after the death/divorce of a spouse.
The fatwa issued in India was completing and totally misguided and haraam, as several scholars have written about previously.
Please sister be very careful claiming to have knowledge of something that is not correct.