Taking back a gift

Q: Married sisters gifted their share of property which they received from their father to their brother. After 2 years some dispute occured between the brothers wife and sisters, and now they are saying to return their property.

Is it allowed to take back the gift which they have done earlier?

Greeting with salaam alaikum

Q: Is it ok to just say سلام عليكم? In Hayaatus Sahaabah (Part 2), under chapter 9 -

خروج الصحابة رضي الله عنهم من الشهوات - :التسليم على المسلم - عمل ابي امامة رضي الله عنه في ذالك

A riwaayah comes wherein Abu Umaamah رضي الله عنه said this.

Heartache after a close friendship breaks

Q: I am a Muslim girl and I am really suffering from heartache. I had a female best friend. She was more than a sister to me and I love her so much. I really wanted her to be in my life forever but today she said to me that she will not contact me from now on. She really wants to end my part in her life. I am so used to her that I am feeling like I have lost everything by losing her. She just said that she will text me once in a while but will not share the bond we used to share. I am so disturb. I really want her back in my life. Please advise me.

Allah Ta'ala will not punish one person for the sins committed by another

Q: I’m a non-Muslim. I want to know what does Islam say about Judaism saying if your mom isn’t an Israelite but your dad is, you’re not an Israelite and you were cursed since birth because of the parents’ mistakes and your parents are cursed by God for their mistakes?

Can you please give Quran verses about that? I believe Judaism is unfair for that. Why do Muslims have bara for the Bani Israel i.e. the Jews if Jesus was one?

Using water from a water pipe that was connected illegally

Q: Is water from a water pipe which was connected unauthorisedly with the Govt. water supply scheme for distribution to the authorised consumers but not commissioned till this day, permissible for drinking, ablutions, washing, etc. in view of Islamic rules. The Authority knows and sees but did not taken any legal action against them or regularize the connections.