Father

No matter how bad, abusive and insulting your father is, you must tolerate and behave well with him. He is not worse that a Kafir parent, and we read in Quran and Hadeeth to treat non Muslim parents nicely and talk to them nicely.

Never alter  a word which can make him unhappy.

Be patient and tolerant whatever he says.

Your reward will be great iA.

Wassalam.

It depends on the father's statement whether he meant giving her the full choice to marry whom ever she selects in Nikah or Mut'ah marriage.

If he was meaning permanent marriage Nikah only, then she still needs her  father's permission for Mut'ah.

'Wassalam.

First if all you should have concrete evidence against that person before accusing him of doing black magic, then another concrete evidence that he is doing it against your father. Before have such concrete evidence against that person, you might fall in a major sin of putting allegation on that person.

You have no right to tell any one about what you think about that person before having the concrete evidence against him.

As far as the black magic which you think is done against your father and his family, the remedy is the same whether it was really done by any one or not. Even if it was not done, it is useful to protect your family by the same recitations which are: Sura Al-Falaq and Sura A-Naas to be recited after every prayer and before going to bed three times, as well as Ayatul Kursi. Sadaqa is also very useful in protection from evil.

Wassalam.

It is not allowed at all to cause any type of insult or disrespect to your parents. You should always serve your parents, and not to ask them to work at home.

We should treat and serve our parents with full respect like we treat and serve a king or a queen. Obviously, you will never ask a king or a queen to help with housework.
Wassalam.

Virgin girl does need her father's permission for her marriage if her father is a Muslim and does not reject the marriage for un Islamic reasons. Your father does not need to attend your Nikah but he must agree on it if it is your first marriage.

There are certain cases when this condition becomes void like when you need the marriage to save yourself from sinful act, and your father is refusing the marriage for reasons which are invalid in Islam.

Wassalam.

If her father is non Muslim and she is a Muslim, then no authority for her non Muslim father on her and she will be able to decide her marriage with suitable believer.

Wassalam.

No one has any right in inheriting from this man but his own two daughters and his wife if she was alive when he passed away. Wife should  get one eighth and rest should be equally divided between the two daughters. If no wife was alive when he passed away, then all the property and wealth should be dived equally between his two daughters only. No one else from the relatives is entitled for any inheritance from him. This is according to Ahlul Bayt (AS) who have the real teachings of the Prophet (SAWA). Sunni brothers have something different which prevents the daughters and give to other male relatives, which is away from Quran and Real Sunnah.

'Wassalam.

If the marriage between your father and her was consummated, she became your step mother and a Mahram for life even if she is divorced later on from your father.

Wassalam.