Various masaail of Nikaah

Q: Why doesn't Islam forbid marriage during early teens after puberty (like 14,15) as it increases various risks (like death of mother)?

Q: What will be the effect on the Nikah if a man has a relationships whith his brother's wife in his brothers absence and what should they do to be forgiven by Almighty Allah.

Q: I have a question that confuses me often. I have read in the Islamic books that women is created from the left rib of the men and therefore matches are made before a person comes to this world. This means that each man and woman on earth has a match. Then what about the man who never gets married or women who never gets married when they have their match in the world. And if a person does not get married, what about his/her destined match? Does his match also does not get married? And those who pass away as a bachelor, does his women never gets married, as a person only gets married to those with whom they are destined to be with.

Q: I'm proposed and the date that has been set for the nikah has a high possibility of coinciding with my menses. What should I do? I'm so confused. Please advise me.

Q: I want to understand the shariah way of performing nikaah of a girl and a boy. There are too many customs prevailing among Muslims of different region and everyone claims that theirs is the correct way. Please guide.

Q: There is a proposal for my sister. The guy works for State Farm Insurance. He is senior claims advisor in the total loss department. He works in the auto property damage department. Is his income halal? Should we say no. My sister doesn't like that his income is from insurance.

Q: Can a husband use his wife's hairbrush or comb and she use her husbands? Someone told me its disliked. Is this correct?

Q: I want to ask that husband and wife are living together, but husband deliberately not doing sex with his wife. The reason is that he is saying that he doesn't like her. It's been one month since their marriage but husband not giving rights to his wife. I just want to know what will be the impact on their nikaah and till how long their nikaah will be valid?

Q: Is it permissible for a woman to live in her husband's house if her husband is not there for a long time?

Q: Is it obligatory for a wife to serve her in-laws if her husband asks her to do so? What are the duties of a wife towards her husband's family? Please guide me in the light of Quran and Sunnah.