1. Obtain certified Family Tree from the jurisdictional revenue office where the property is situated. You can also obtain legal heirship certificate from the revenue authorities in Maharashtra showing you as one of the legal heirs.
2. The time has lapsed. However you can still claim your share after a period of 15 years stating that you were unaware of the transaction and now only you have come to know , that you are cheated and hence request the court to consider your case and request for condonation of delay.
3. Since the property is in Maharashtra, you have to fight initially in the jurisdictional Civil Court of Maharashtra.
4. Bring an Injunction not to sell the property by your siblings, which will prevent the disposal of other remaining properties in future without your consent.
5. To claim equal share in the property already sold, send a legal notice to your siblings, as well as to the buyer of the property, so that you receive equal share in the already sold property and to prevent sale of properties in future without your consent. This legal notice can be sent from Bangalore itself.