Nikaah & Marriage Issues

Q: I want to ask about mahr. Does the entire amount of the mahr have to be paid on the very first night of the wedding or can some be paid on the wedding night and the rest will be paid later?

Q: If a brother touches his real sister with lust does it invalidate their parents' nikkah?

Q: Is marriage obligatory for the men living in a place where the number of women are more than men so that no woman stays unmarried?

Q: I recently converted to Islam and I am in a relationship with one muslim man. His family is making him married to one of his cousins and he dont have guts to take a stand. Now my family is hindu and they will make me marry a hindu man. I am afraid I will be in haram relation with him and the man whom I love is not willing to take a stand for me for his family. I am left in middle of nowhere. I can't live my life with a person who does shirk and is non believer plus my family don't know I have converted to Islam and they won't understand and force me to marry a hindu man. What should I do? Please help me. Please I can't leave Islam.

Q: Suppose a person is committing sexual sins but he can't stop committing sins by other ways than marriage. Will marriage be still fard for him? What if he or she fears to not giving the spouse his or her rights?

Q: If a unmarried person feel a high sex drive many times, although that person wish to get married but it doesn't make possible. Can that person try self movements to satisfy and please sex drive and feelings? What possibilities are available in islam in that case?

Q: If a person touches a woman with desire does her sister becomes haram for him?

Q: I have a question that my wife is pregnant for the second time. We have one more baby Alhamdulillah. In a couple of days, we have seen that we have lost our first child and later we got her in the dream. We want to give Sadaqah of our first child as well as of the baby who is in his/her mother womb. So is it possible that we can give Sadaqah of the child who is supposed to come in Duniya very soon?

Q: Are you allowed to freeze your placenta and eat it or make it into pills and then consume it?

Q: My wife is expecting and the test result shows that the foetus which is 15 weeks old has a chromosome disorder trisomy 18 which means that either there may be a miscarriage or if the child is born, the baby will be having several physical defects and may not survive long. There is no risk to the mother's life in general. Please advise what should be our approach.