Mahram and Non Mahram

Mahram Through Blood

Mahram Through Marriage

Surah An-Nur/Noor me Ghar ke Andar ke Parde ka Bayaan hai

https://quran.com/an-nur

https://quran.com/24

Surah Al-Ahzab me Ghar se Bahar Ke Parde ka Bayaan hai

https://quran.com/en/al-ahzab

https://quran.com/33

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Mahram wo hai jisse kabhi yaa kisi haal me Shaadi nahi ho sakti hai

Aur Non Mahram wo hai jisse shaadi ho sakti hai

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Mahram

https://youtu.be/3ArMONTYffc

It is permissible for a woman to take off her hijab in front of her Mahrams ().

Walid, Bhai, Shauhar, Beta, Pota, Nawasa, Chacha, Mama, Bhateeja, Bhanja, Sasur, aur Aurton/Biwiyon/Wives ke Aaba wo Ajdad bhi Jaise Aurton ke Walid aur upar di gai list Mahram hai.

Isi tarah Rajai Bhai, Baap, Damaad bhi Mahram me aate hain.

Non Mahram

Baaki sab Non Mahram hai

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Mahrams 

1. Mahrams by ties of blood

2. Mahrams by breastfeeding

3. Mahrams by marriage

And tell the believing women to reduce (some) of their vision and guard their private parts and not expose their adornment except that which (necessarily) appears thereof and to wrap (a portion of) their headcovers over chests and not expose their adornment except to their husbands, their fathers, their husbands' fathers, their sons, their husbands' sons, their brothers, their brothers' sons, their sisters' sons, their women, that which their right hands possess, or those male attendants having no physical desire, or children who are not yet aware of the private aspects of women. And let them not stamp their feet to make known what they conceal of their adornment. And turn to Allah in repentance, all of you, O believers, that you might succeed.

(Quran 24:31)

The mahram by marriage of the father's wife is his son from another wife for the wife of the son it is his father, and for the mother of the wife it is the husband Allah says in Surah An-Nur (interpretation of the marriage)

"and not to reveal their adornment except to their husbands, or their fathers, or their husbands' fathers, or their sons, or their husband's sons" (An-Nur 24:31)

The husband of a woman's daughter is one of the mahrams through marriage, so it  is permissible for him to see of her what he is permitted to see of his mother, sister, daughter, and all other mahrams.

For a woman to cover her face, hair, forearms etc. in front of her daughter's husband is a kind  of extremism in hijab.

Mahram by ties of blood

These are the ones mentioned in Surah An-Noor, where Allah says (interpretation of the meaning):

"and not to reveal their adornment except to their husbands, or their fathers, or their husband's fathers, or their sons, or their husband's sons, or their brothers or their brother's sons, or their sister's sons. (An-Noor 24:31)

As for non-mahrams, if you are a female, your male cousins are not mahram to you from both sides of the family. Your aunty's husband is not mahram to you from both sides of the family as well. Your brother in law is not your mahram, and the same goes for your brother in law through marriage. These are considered your non-mahrams and hijab must be observed. If you are a female, then other females are mahrams to you too.

Mahrams by breastfeeding

A woman may have mahrams through rada'ah. It says in Tafsir Al Alusi:

"The relationship of mahram which permits a woman to show her adornments may be through rada'ah as well as through blood ties, so it is permissible for a woman to show her adornments to those who are her fathers or sons through rada'ah" (Tafsir Al-Alusi 18/143)