Living with one's grand father due to abuse

Q: I am a Muslim. My dad drinks alcohol and comes home in the evening and my step mother complains to my dad for simple mistakes and my dad abuses me and sometime beats me. Every day this happens. I have no freedom. They treat me like a prisoner. Recently I left home and came to my grand fathers house. Life here is peaceful. My father is calling me back but I am scared to go because those things will occur again in my life. I don't want to go back. My grand father is supporting me too. But I have a doubt should I go or should I live live with my grand father. Please help me and
give me the best answer according to Islam.

Being separated from one's husband for ten years

Q: My sister has not lived with her husband for almost 10 years now. She has nothing to do with him as husband and wife, she feels nothing for him as her husband. She got married  in Pakistan, but she lives in Denmark. She has been divorced in the Danish paper, but he has not signed, and according to Danish law they are not husband and wife any more , but her ex-husband denies , and admits that she is still his wife. How are the rules for a woman if she wants to be divorced?

Chatting to a na mahram on whatsapp

Q: I  want know is it fair towards a woman if her husband has a lady friend which he has more time for. He wattsapp or sms's her at night and when I ask him he tells me I am always negative. And this is going on for years. I told him that I will speak to his boss because they are working together. On Saturday I asked him is he so late on wattsapp with her, he blocked me on wattsapp. If he has nothing to hide so why did he block me? Please advise.