Non-mahrams

Brother in law and sister in law observing strict purdah

Q: I recently heard someone say that it is permissible for the sister-in-law to not make parda from her brother-in-law when: 

1. There is no scope of fitna. 

2. When it becomes difficult for her to leave her own room for basic needs. 

My friend has recently married into a family of 6. They live in a small flat. Her brother-in- law is 6 years younger than her and she claims he is an actual replica of her brother in her maternal home. There isn't a chance that they can ever be alone. It becomes difficult for her to constantly be in her cloak, burkha and pardah the entire day almost as if she is at a guests home and not in a home that she has a right to stay in. What is the ruling regarding this?

Observing purdah from one's daughter in law's father

Q: My dad is late (may the Almighty grant him jannat). He has left behind 2 sons and 2 daughters. The eldest son lives with his father in law.

After mummy's iddat, it was her desire to perform umrah and her second son took her Alhamdulillah. The elder son wants to take my mother, his wife and his father in law, who is also a widower, for umrah. Will it be permissable for my mother to travel like this in the company of his father in law?

Are the children of one's adopted father's second wife mahrams?

Q: I'm adopted by my parents. My adopted mother then breastfed me so they became my foster parents. In 2021, my mother (foster mother) passed away and my father got married to another woman. She already has three children. Are they mahraam to me? Should I have to make purdah from them? Is it permissible to marry them at the same time?