Nikaah & Marriage Issues

Q: My sister was 6 months pregnant when a scan showed the baby was not growing well. The doctor said this is a case that the baby will not grow properly. The baby has no lungs and is just alive on the mothers breath. The doctor said if you wait for normal delivery there will be some risks in the delivery and also to the mother's health. The doctor advised to terminate the baby. And we accepted the advice. The baby was delivered and in a few hours died. Sometimes I feel it was not the right thing we done. Maybe if she delivered on her own time then the baby would be alive. 

What is the Islamic ruling? Was what we done a serious sin? If yes, is there a chance of Allah's forgiveness?

Q: Is a secret nikaah in which there are witnesses and where immediate family have been notified acceptable under Hanafi rulings?

Q: After the child is born, what are the sunnats and aadaab that should be performed?

Q: I wanted to find out if I go to my father's house for holiday, is my husband still financially responsible for me during my stay there or is it my father's duty?

Q: The bride chose a musjid which has a ladies section and desires to be present for her nikkah. Is this allowed? 

Furthermore, does she have to choose the musjid closest to home or can she use a musjid 2.5km away?

Q: If a man divorces his wife with three talaqs and remarries her without hullah (intervening marriage), and a child is born from this marriage, will the lineage be established?

Q: 

1. What kind of illnesses would one have to disclose when seeking a wife? 

2. If the illness is not current, does it have to be disclosed i.e. if one used to have ocd/waswasa issues in the past and one has healed a great amount, would one have to inform a potential spouse of it in case it could creep up again? 

Q: Is this genuine that for nikaah, first the father and mother of the boy should go and see the bride followed by the sister/sisters and then the boy should go and see the girl for nikaah. This seems as the different rounds of selection.

Q: After urinating, when rinsing the private area with the hand shower, the pressure of water is satisfying sometimes. I get really aroused. Is this counted as masturbation? Do I have to perform a ghusl?