Mother having an affair

Q: My mother is cheating us by having physical relation with other man . And me and my younger brother caught this and we tried more than three times to forgive her and advice her and show her the right path. She used to do five time namaz every day from her childhood itself but she cannot control her temptation with this man and always they are making physical relation when they get a chance. I am always a silent boy but my brother can’t control his anger and today he punched her because after promising upon allah that she will not repeat it she is continuing the relation and my brother caught again their voice calls and it’s beyond the limit . Sir please give me some advice to how to handle this situation.. and is it allowed to beat mother in this situation..

Women reading Taraweeh in jamaat

Q:

1. I wanted to know if two women are reading Taraweeh together, must the one leading for those rakaats stand a little forward and the one following a little behind, or must they stand in line?

2. If one woman isn't reading, can she sit with a Qur'aan next to the one who's reading Taraweeh, and correct her if she makes a mistake ? (The one reading will be reciting in a slightly audible tone, is this permissible as well?)

Teaching students about interest bearing loans

Q: I have to teach students the advantages and benefits of taking loan and paying interest as it is given in the syllabus of finance.

Example: When a Company takes a small amount of loan and pays interest, it gets many benefits like tax deduction on interest paid and other benefits... I am just teaching and it is my job. I am not paying or using or consuming interest in my daily life as it is haraam. Please tell me if I am doing any sin or I will be punished for just teaching the syllabus to students? 

Validity of the nikaah

Q: A woman once tried to make a man fall in love with her. She said a dua, blowed into water and then gave the water to a man to drink to make him fall in love with her. She understood that she has done a wrong thing. She repented. Now whatever she has done, does it make marriage between the above man and woman prohibited?

Muslim manager advising the company to take out interest bearing loans

Q: I am working as a Finance Manager in a company. I perform various duties of my job like Financial Planning Analysis.., and one such duty is to advise the company on raising of money for the business and I advised to raise from equity and debt (loans)

On my advice the company takes small amounts of loans and pays interest (riba). It gets many benefits like tax deduction on interest paid and other benefits... But the company has to pay interest (Riba).

Since India is Darul Harb, I have no choice of interest free loans. Moreover I am just advising and it is my job. I am not paying or using or consuming riba in my daily life as it is haram.

1. Please tell me If I am doing any sin or will I be punished for just advising the company? Because I have heard Hadees that all those persons are sinful if they are involved in riba related transactions and riba is haram.

2. Is my job and salary halal?

3. If I am earning 1000 Rupees for 10 hours daily and I performed this riba Advise work for 1 Hour and Earned 100 Rupees, is it compulsory to donate that 1 hour salary of 100 Rupees as charity ?

4. Can I perform all my other duties