Nikaah & Marriage Issues

Q: Is marriage with mother's uncle's daughter permissible or not?

Q: If a man wants to marry another woman can he marry without permission from the first wife? If she doesn't give permission and he marries the other woman anyway is it a sin?

Q: What are the correct reasons to use contraceptives (condoms, tablet or any other way)?

Q: Can a Muslim girl marry a sikh boy without changing her religion and live happily?

Q: Is permissible to have a walima in the same town where we had the wedding?

Q: My question is that my nikaah ceremony is going to be held on this 15 of october which will be in islamic month of Muharram. I want to ask that is it prohibited in islam to get married in month of muharram? and getting married in month of muharram brings any misfortune or bad luck and sorrows in later life?

Q: Whilst I was doing some work, I got aroused. I tried to ignore it but I was feeling overpowered. I held my private parts and squeezed my legs trying to kill the feelings but it made it worse. I was sitting and trying to ignore it but I ejaculated unintentionally. Am I sinful for this action?

Q: What is zawjatul misyaar?

Q: If a woman breastfeeds her adopted daughter through taking tablets to produce the milk, will the mahrams of the woman (father, brother, paternal uncles, maternal uncles) and the relatives of the woman's husband (father, brother, paternal uncles, maternal uncles) all become mahram to the adopted girl child?