Dear Madam,
No doubt, you have every right to claim your share in your father’s property. File a partition suit in Civil Court and get your share.
The following information may kindly be read.
According to the Hindu Succession Act, 1956, a son or a daughter has the first right as the Class I heirs over the self-acquired property of his or her father if he dies intestate (without leaving a will). As a coparcener, an individual also has the legal right to acquire his or her share in an ancestral property.
The basic principle of Hindu law is -
If it is your self acquired property, you can do as you please with it. You can give it away to a stranger on the road or a charitable trust. Doesn't matter.
If it is your ancestral property, then your children take a share the moment they are born.
When you die without making a will (intestate), your property becomes ancestral for your children.
So, to answer your question, if it is your father's self acquired property, you cannot ask a share against his will. If he has dies intestate it becomes ancestral property and you will have an equal share with your brother and mother.
Succession for a Hindu male dying intestate is thus -
Children, wife and mother take the first equal share. So, if A dies intestate, his wife, daughter, son and mother, all will take 1/4th equal share in his property.
There are many many other complex rules but I am not going there for the purpose of this answer. After the amendment to Hindu law, daughters take an equal share in the property.
Lastly, if it is your father's self acquired property, you cannot ask for a share against his will, but if he has refused to support you, you can claim maintenance from him. Applies to both boys and girls.