Marrying one's student

Q: I am a Muslim and 29 years old. I was an engineering student and during my bachelors education I used to teach Science Subjects to Intermediate co-education classes (11th and 12th Grades) in an Academy to meet my expenses as my father was suffering from financial crises. I used to control myself from developing feelings for the opposite gender and I succeeded nonetheless.

After 4 years of teaching, when I graduated from University, I found a better job and went outstation and I have been currently serving as a Senior Officer for 6 years.

When I got my job, my parents started searching for marriage proposals for me but they could not find a good proposal for 2.5 years. It has been 6 years since I left teaching.

The issue is that 2 years ago, I along with my class fellows had a get together in the University, and after having the meet up, when I was going back home, I saw one of my past female students (She was the sister of my my class fellow and I knew her even before teaching) in the University Library coming in front of me after so many years and her habit of keeping her gaze low and noble character forced me to develop feelings for her and I started to think about her as my wife.

After thorough thinking, I then sent my proposal through my family to her family and her family accepted my proposal whole heartedly because they already knew me.

My Question is that Is it allowed in Islam for me to marry her as she was one of my old students although at the time of teaching I did not have feelings for her in my heart and I am not teaching anymore? 

Saying that someone is busy when answering a call

Q: I served in a Pvt Limited Company. Part of my job is to receive phone calls and to transfer it to my senior's and boss. Sometimes, I receive a phone call and when I transfer it to my boss, he tells me to tell the caller that he is busy in meeting or not available in the office whereas he is free and present. The issue is, it is a lie. Will I be sinning for speaking lies?

Leaving a mixed engagement function

Q: My sister had an engagement function recently. I was under the impression that it will be completely separate. I had spoken to my sisters and mother before and they said there will be a purdah in the center and my sister will sit on the ladies side and her fiancè will sit on the mens side.

On the day of the engagement when I went to the hall there was incomplete seperation between males and females - the partition covered only 2/3rds of the hall. Men seated at the front were in full view of women seated at the front. There was a table for both the bride to be (my sister) and the groom to be seated together on the ladies side. There was only 1 tea table was set for both men and ladies.

I tried to speak to my sisters who were there that it wasnt what I had expected but they kept brushing me off. I was then furious and I phoned my mother and told her that that was not what I had expected and that I will not attend the function. I might had spoken to her abit harshly. She spoke to my sisters and they decided to put a second pardah at the back but it was still not good enough as the seperation was incomplete.

This was a few hours before the function and we went back home to get dressed for the engagement. My cousin and brother in law started arguing with me that its not serious and that its my sisters function and im being too harsh and strict. When I spoke to my wife she was half minded about going but we decided to go to keep family ties. My wife is in niqaab and after the function started, she told me that she is not happy with the incomplete seperation, 1 tea table and that the bride and groom to be seated next to each other on the ladies side. My wife ask me to drop her off at home which I did and I was half minded about going back, I did but I did not go into the hall to eat but stayed outside and helped them to dish out etc.

My family is very upset and disappointed that my wife left the function without saying anything and that I did not sit and partake of the food which was served. I felt it was wrong for me to be part of such a gathering as I wear kurta, turban and have a full beard. They feel that we are breaking family ties when Allah commands us to obey our parents even if they are non Muslims. I am the only son by the way. They are also upset about the way I spoke to my Mother. They are saying that people were asking them where is my wife and why am I not in the hall. Someone else had also said we visit shopping malls which are mixed and make tawaaf which is mixed therefore howcome we "made such a fuss" at the engagement which was not completely seperate. They also say that we do other things that are not correct so why are we so strict with this.

Kindly advise whether what my wife and I did was correct, how to unite the family and the way forward regarding such events in future. Any other advice will also be appreciated

Taking out life insurance to save tax

Q: Is it permissible to buy a life insurance policy, not so that my heirs can benefit from it; but merely to cover inheritance tax/estate duty that is so exorbitant that due to not having so much cash funds in the estate, essential assets such as the house in which the heirs live in has to be sometimes sold just to pay the estate duty? The heirs will be instructed that after paying the duty, the surplus must be given away in charity without intention of reward.