This was your deceased mother's property.
Your mother died intestate, i.., without making any arrangement for the property left behind by her.
In he above circumstances the property will devolve equally upon all her legal heirs.
Thus you are legally entitled to 1/3rd share in the property, if your father and brother are creating any problem, you may seek partition and separate possession of your property.
You can file a petition suit and also file an application for injunction restraining the defendants from alienating the property till the disposal of the suit.