Nikaah & Marriage Issues

Q: My dad married a woman I was involved with. We had a 1 night not even a night (20 minutes in the back of my car). He had no way of knowing. She didn't know he's my dad either. I work in another country and only met her after the weddding. I'm not learnered islamically but know that this marriage is not valid. How do I tell him that? He is my father. She has changed her life a long time ago and is in hijaab and niqaab. What must I do please advise with an open mind.

Q: I am maried for 9 years. I stayed with my parents for 8 years, then moved out for 1 year. Now my dad had his leg amputated and I think I need to move back. My wife on the other hand says she will never move back to my parents house even if it means divorce. I even told her I will build a cottage in the same yard. What is your advise? I have a 2 year old son who my parents really love. If we separate my wife will probably be spitefully and go to Pakistan with my son.

Q: I got married about two years ago. My husband is a widower and has two sons from his first wife. Masha Allah the kids and I love each other like a real mother and children. But recently I read that Islam is not in favour of adopting children and that it says in the Qur'an Shareef that "your adopted sons are not your own". I am disturbed about my position now as I had married with an intention to love these kids as my own.

Q: Why are Muslims allowed to marry four wives? 

Q: How long can we delay to perform nikah until all the guests arrive?

Q: Should food be prepared for the nikah or only for the walimah? Must it be the cheapest possible, like fresh fruit and vegetables instead of biryani?

Q: There was a time before I knew of whispers of the devil. I should think what if  Prophet Muhammed (Sallallahu Alayhi Wasallam) or someone else wants the women that I want or I should not pursue to marry a women because I have great love for her ,she's beautiful, etc and maybe Prophet Muhammed (Sallallahu Alayhi Wasallam)  or someone else wants her. I should also possibly think other stuff in this regard. I may have said stuff in this regard, will I be forgiven for them and are these thoughts whispers of the devil? 

Q: Can I pray for a non-muslim guy to accept Islam. I want to get married to that guy if he accepts Islam.

Q: An old man is suffering from erectile disfuntion. No medical help works. When with his wife, can he mastubate to ease his desire?

Q: Give me a dua so that my husband loves me.