Nikaah & Marriage Issues

Q: Please confirm if the following is correct.

Q: Is the nikah valid of baligh girl who married a boy with mehr and proper witnesses but her mother is displeased. Can such a nikah be null and void?

Q: Is it permissible to have the Walima 1 or 2 weeks after the Nikah, or does it have to be done within 3days after the Nikah?

Q: What is the requirement for Walima? Is it necessary that the bridegroom has sex with his bride and then has the walima the next day. If the bride has her periods on the wedding night and the bridegroom cannot have sex with her can the walima be performed the next day? Will the walima be valid or not? Please answer in the light of Quran and Sunnah.

Q: There is a couple who are separated for nearly two years, and recently they divorced - now the wife asked for divorce. I want to know if the husband has to pay her anything, like mehr money, as the wife demanded mehr money and some others. Is it right? does the husband have to pay even if the wife divorces the husband?

Q: A female who is Aalima got married with a non Aalim without the parents consent (in secret) is the Nikah valid? 

Q: I am computer science graduate and working in a multinational in my homeland. Throughout my life I have struggled hard to get my achievements because I am a disabled person. My left limb is artificial but Alhamdulillah I have always overcomed my disability in my life. Now I am in a very good position to support myself as well as my family. After my disability I have moved and studied with others and I also do the same jobs like other normal people. My personal analysis is that I can do Nikah which is declared a part of faith in Islam. My parents are also emphasizing upon me to marry now at the age of 29 years. I love my religion and try to follow all sunnahs Alhamdulillah. The questions I like to know is that   I know a lady not in my family but relative to my elder brother's wife whose husband died in an air crash in Pakistan. This widow lady is the mother of two and also taking care of her husbands mentally disabled sister. I have intention to marry this lady as I have met her late husband once in life and due to the character Islamic personality of her late husband I wish and  feel  to provide the love & care  to her and her children in an Islamic manner. My wishes and intentions are all within the limits of my religion but my disability is the obstacle in my  powerful ambitions. I have to take this important decision in my life so everything I wish to do is according to the will of Allah. I have few questions to ask you.

Q: Please could you answer the following question I need the info to settle a dispute. I was taught that when a person gets pregnant out of wedlock and gets married to the person the child is still considered illegitimate if born fewer than 6 months after the marriage. My sister-in-law says that if the mother has 7 children altogether that it will then make the first born halal. Could this possibly be true? I battle to grasp the logic. Please help.

Q: A girl claims that I am responsible for her failed marriage and accuses me of concealing from her the truth about her in law's and husband's evil character and habits. Prior to her marriage, when asked my opinion about the family, I told her family that from my interactions with the boy and his family and from what I had heard about them, I was never given a reason to believe that they were anything but good people. They then proceeded to do their own private investigations. The girl says that I should repent and will be questioned about my actions on the Day of Reckoning. Can you please also comment on whether a boy is destined to have an unhappy marriage if his parents were separated (but have since reunited) and if his grandfather made nikah with a second wife?