Various masaail of talaaq

Q: Me and my husband were living separate and the divorce proceedings were in the court pending . Legally we were not divorced and he never said divorce word to me and while the divorce was pending he passed away his parents and family did not contact me about his passing away and when I said to them he was still my husband because divorce wasn't through yet they said no, in our eyes you are divorced and you have got no right to know he passed away. My question is, was their behaviour right about not letting me know about my husband and telling everyone that they are divorced although divorce wasn't through yet ?

Q: After divorce of parents, are the children still brothers and sisters?

Q: I need to know whether in Islam a woman can ask for divorce from her husband when things become so difficult for her to bear? If yes, what is the procedure? If no, what can she do?

Q: I want to know if nikaah before rukhsati, husband and wife meet each other and after some time they want divorce, then should this be carried out?

Q: I want to know that can a person divorce his wife without any reason at all?

Q: Is it permissible for the husband to issue talaaq to his wife while she is in her menses and will the talaaq be valid?

Q: If during an argument between husband and wife, husband says if he sleeps with his wife in future it will be like zina. Husband has no intention of giving divorce to his wife. Husband also is not aware of the ruling /punishment for that saying. What is his position now and what should he do? Is it any where close to zihaar.

Q: Prophet Ibrahim (Alayhi Salaam) told Ishmaal (Alayhi Salaam) to divorce his wife. Ishmael (Alayhi Salaam) did. My parents demand the same. My wife prays and wears hijab and is from a different country from me. My parents want me to marry women who are more cultural and don't wear hijab, since none of their 4 daughters/my sisters wear hijab. To what level of authority do parents have?

Q: Are post nuptials allowed or are they haraam?

Q: Please explain the meaning of zihaar and if this has anything to do with talaaq. It is stated in the Quran that if a man wants his wife back then he should fast for two months or feed sixty poor people.