about the property

एक स्थानीय वकील से संपर्क करें क्योंकि वह आपके पक्ष में ऐसे तथ्यों और सबूतों का अध्ययन करने के मामले का फैसला करने के लिए अधिक सक्षम है।

You can file a suit for permanent injunction  agaisnt them to restrain them from forcibly evicting you from the premises other than by due process of law. 

You can produce the documentary evidences to prove your possession and continuous enjoyment of the property.

Without knowing that how he had taken away your father's property no further suggestion can be made, hence you better consult an advocate in the local for all such further issues.