remarrying

Q: My husband and I have been separated for a year now. In May this year, he sent me an sms stating "I am giving you 1 talaaq in writing so you cannot deny it". We have not had any intimate or sexual contact in the last year.

My question is: Is my nikah over and am I allowed to re-marry? I understand that my iddah started from the point where he gave me this one talaaq and lasts for 3 menstrual cycles. The 3 menstrual cycles are over now but I did not observe iddah in the correct manner as I did not know at that time that I was in iddah.

Q:

1. My cousin's husband passed away last year and she wants to know that if she remarries, which husband will be her partner in the ahkira?

2. Does her children have a right to stop her from getting married. 

Q: My husband and I have a daughter Alhamdullilah and Allah has blessed us with twin boys who will be born soon In Shaa Allah. I am stuck as to what to do. My mother who has decided to marry again this will be her forth marriage but this choice has made both myself and my sister very unhappy we are heartbroken about it as she has before gotten married without our knowledge. Now this time she has told us that she made this choice and did not ask our opinion or how we felt. I know it is Sunnah to be married, but this decision has caused so much pain to my marriage as well as my husband is always saying really bad things about her and I am constantly having to pick sides. I cannot find a way to solve this I am suffering but cannot explain to my husband that she is still my mother and I need to respect her but what if I can never accept her decision to marry again. I don't want my children to suffer as well and I am afraid this will cause her to not meet with her grandchildren. May Allah guide in this difficult time. Based of the above. Is what my mother is doing correct by choosing to marry over the heartbreak of her children?

Q: I have been married twice before and have three children. I am living back with my parents (mom and brother) since earlier this year, but work and see to the kids for everything excluding rent to stay. I am having a hard time coping financially. I would like to remarry but my brother (my father has passed on some years ago) thinks it is too soon and will not meet the man that has put the proposal forward. My question is do I need consent from my brother and or mother?

Q: I just wanted to ask a question. I am having my nikaah done at the mosque in a week. I have researched upon the topic of allowing your husband to remarry. I wanted to have a condition in my nikaah that my husband should not remarry whilst he is married to me. If he was to do so and hide it from me he will be negligent upon his part. My query is where I live we don't have any blank space etc on the nikaah form to write such a condition. Is it enough for me to just mention it to my husband at the time of nikaah or before etc? He is already aware this is what I want as I have told him before. But online I have read on many sites that you should mention these things at the time of the nikaah otherwise it will not be valid? Please tell me how I should go about it.

Q: Please inform me regarding remarrying one's ex-husband after khula'?