Before commenting, you should read the law, As per Islamic Law, there is no ancestral property or Joint family concept exist in the Muslims, the rules of inheritance is very clear that the property can be divided by the legal heir of the owner of the property, as the property is related to your grandfather or great grandfather then you are not the legal heir until your father is alive.
Alimony for your mother can be claimed if your mother has no source of income and not able to maintain herself then your mother may file a complaint under section 125 of Cr.P.C. and claim maintenance.
she may file a domestic violence case against him before the magistrate and claim the right to residence, monetary relief, and compensation under section 12, 18, 19 & 20 of The Protection of Women From Domestic Violence Act-2005
Law cannot be interpreted by the people but only by the Courts in India.
Dear, when there is no hope for you legally then why are you insist that my opinion in not good, it means you want a reply from the panelist only which satisfy you, so I am not a person who answers the query of the people without any law and logic, my reply will be based on Law and as per law you are not entitled to get anything from your father without his will and wish, legally.
If you are not able to understand then it is your problem, I cannot satisfy you by the wrong answer to your queries.
suppose I say that you can get the share from the property of your father and file a civil suit for partition or possession before civil court of area where the property is situated, and based on my information you filed the suit and pay the fee to lawyer and also deposit the court fee before the Civil Court and on the date of hearing the opposite counsel appear and argue the matter that this suit is not maintainable as per law and your suit should be dismissed, after hearing both the parties the court find that yes, the counsel of the opposite party is right and dismissed your suit, then......????????????
So it will be better to try to understand the law, Indian law and the Islamic Law both will be applicable in your case.
a person who is not caring for his family and live in adultery or having affairs and commit cruelty towards his wife and children, then there is more and other remedies are available.
remain, it was your query, it was your problems, we are here only to give our opinion if you think that our opinion is good for you then take it otherwise search for another.
Thanks for mentioning your view.