Performing salaah while sitting due to dizziness

Q:

1. Zaid at times wasn't feeling well when praying his salah so he prayed with ishaara sitting on a chair, before the salah time expired he felt better, his condition was such that he could have prayed properly with sujood etc., is it compulsory for him to repeat the salah prayed with ishaara sitting on the chair?

2 a. Zaid is able to pray properly at home with Qiyaam and sujood etc. but when praying in the masjid he doesnt feel well, he feels dizzy, will his salah be valid if he prays in the masjid sitting on a chair with Ishaara?

2 b. In the above situation is it better for Zaid to pray five times salah and Jummah salah in the masjid with Ishaara sitting on a chair or pray at home with Qiyaam and sujood etc.?

Are children obligated to fulfil a promise made by their parents?

Q: Me and my sister are co-owners of a flat. We agreed to sell it. Following a discussion between two of us over the fact that I will lose money, she said in a WhatsApp chat to me: “u will not lose money. Once it’s sold I will give you most of my share too. It has been my intention to give you the money all along.” Since then my sister has unfortunately fallen very ill and is in a coma. Her husband and children are now in charge of her affairs. Are they required to abide by the promise she made to me via WhatsApp once the flat is sold?

Making musjid property a pathway for people

Q: I am from a small village of Kashmir. We have planned to build a jamma masjid in our village. The land adjacent to the old masjid plot is donated by somebody for a madrasah. Can we use a part of the donated land to make an alleyway i.e. a passage to the masjid so that the street becomes a free passageway for villagers on the other side of the masjid. It will become more convenient for passing.

Temporary ligation

Q: I am in a dilema. In a course of 6 years I have had three c sections. I am now pregnant again with my fourth child within a few months of giving birth to my third. Doctors are insisting I get my tubes tied as a c section is a major operation and the risk gets higher every time. Am I allowed to do this due to the reason of this being my fourth c section in such a short span of time?