Nikaah & Marriage Issues

Marrying one's ex husband who wants to accept Islam again after becoming an Atheist

Q: I'm a Muslim and my husband left Islam a year ago and became an Athiest. Since then I am living seperately from him and tried my best to bring him back for the sake of our kid. Now he wants to become a Muslim again. I want advice on what should I do in terms of Islamic law since our marriage was over when he became an Athiest. I want to reconcile as well. But whats the procedure for me and also for him to return back to Islam?

Validity of nikaah if mahr was not mentioned at the time of nikaah

Q: Zaid conducted the marriage of Zainab to Shuaib. But Zainab did not appoint Zaid as wakeel. However Zainab heard the ijab and qubool through the phone and then later when she was asked whether she accepted the nikaah with Shuaib, she said that she accepted. However, she did not notice what was the amount of mahr which was mentioned. So she has no idea about how much mahr she is going to get. Is the marriage valid?

Children born with disabilities due to marrying in the family

Q: In Islam, is cousin marriage allowed?

Medical science says that cousin marriage is wrong because it causes disabled children. Yes, there are many cases where children are completely fine but there are many cases where children are disabled because of cousin marriage.

My Conclusion: cousin marriage is risky.

Please advise me whether we should do cousin marriage or not? If your answer is yes then how can we overcome this risk?

Attributing an adopted child to the adopted father

Q: My uncle in law adopted my brother at the time of my brother's birth, and my uncle's wife breastfed him. Can my uncle be my brother's real father?

In my brother's nikah, if my uncle in law does not declare that he is the father, but the girl knows who the real father of the boy is, is the nikah correct?

Can my uncle in law write his name as the father of my brother?