Various masaail of Nikaah

Q: A Muslim family adopted a female child after birth. Her mother was a Christian. They brought her up as Muslim. Now she is 30 years old and wants to marry a Sikh boy. Adopted parents are in a dilemma trying to persuade her but she is adamant to Mary Sikh boy. They told her they have nothing to do with her. Adopted parents want to know can they go with her to the Registrar's Office and stand as witness and later bring her home with the Sikh boy and members of her immediate family and offer them food then she goes away not to return in future. Is this acceptable or is it haram? Please advise. 

Q: Is it permissible for a husband to prevent a disobeying wife to leave the home to see her parents but not to forbid her to maintaining ties with them with phone calls, that's if she lives in a different country than them?

Q: If one can never marry, say due to disabilities, will zina or any other forms of sexual satisfaction be permissible?

Q: If one intends to marry can he write a letter to the woman to state what he intends from the marriage?

Q: What would happen or what steps do you follow when you as a man are getting married and your father is a murtad? Including the event of the
nikaah and the reception?

Q: I have found a pious partner الحمد لله, Shukr for the duah Mufti it has proven effective. This lady with whom I am happy to be married. I have already proposed and she has said yes... الله أكبر Now, What am I to do Mufti? I surely have to spend some time with her to get to know her ... (going out with her and maybe having lunch with her?) I have noted this as she has grown fond of me during the little time I have spent with her. How should I go about acquainting myself with her so we can get to know one another better? Within a legal framework.

Q: I'm a 23 year old woman living in the United States and my fiancé lives in the Middle East. I've been engaged for a little over a year now. I will be married Insha Allah in summer. My question is, is it halaal for me to talk to him on the phone knowing that both our parents agree and know about it?

Q: Is there any sort of marriage (nikaah) that can take place purely and only for satisfying one's natural urges and desires? In other words, the man and woman only meet for this purpose and other than this, they both do not wish to shoulder any of the responsibilities of nikaah. 

Q:

1. Is it permissible to keep a wedding venue or invite people for food in a church hall, the hall is attached to the church but separate from the hall where the Christians have there prayers etc ?
2. Please explain in detail the reason if its not permissible?