Nikaah & Marriage Issues

Q: Please first understand the whole story then give me an answer. My sister is married to my uncle (father's brother’s brother in-law). Before my uncle died my uncle and my father announced the engagement of his daughter with me, after few days my uncle died. As few years have passed, my grandfather decided that my father will marry my aunt and they got married. Now around 12 years have passed and my aunt is forcing me to get married to her daughter and my father has also agreed. Can I marry my step sister which is not from my father?

Q: My question is can I do marriage just in papers not actually with proper intentions nor physically. Also the female knows its just for papers not actual marriage. Its just to gain visa. I consulted with a lot of people most of them said if you are not betraying the person its fine Islam allows to make secure your future and for a better life. The example in my mind is about our prophet Ibrahim (Alayhis Salaam). He said his wife is his sister. Its just to obtain UK registrar office certificate and to put it in file but to make a strong case you have to do nikaah as well. This all is in papers. Only I and her know about this that this is just for visa.

Q: I need to know that what is the limits and ruling of Islam about the the use of tongue during intercross with wife. Please guide me in this regard. 

Q: Is it permissible for a man to say he'll spend 3 days and nights every week with each wife, but one day alone at his other flat alone? So he can do what he wants like go fishing or for a drive away from everyone. He is not an unfaithful man. He just wants personal space once a week.

Q: Can you please name me some books for children's tarbiyah?

Q: My friend is married and her husband is troubling her to have sexual intercourse in her periods. Please advise.

Q: I am 32 years old and I am married with 2 kids. My father in law and mother in law are divorced. After the divorce my  father in law remarried. His new wife was always kind and caring towards myself and my kids. Now that my father in laws wife and me get along, my own mother in law has an issue about it and she hates that my father in law's wife is a good person. She doesn't want myself and my kids to be good with her. I want to know if its wrong to be good with her or if its right to listen to my mother in law?

Q: Is it permissible to take money after doing someone's nikah? They say: Hazrat, it's for you.