Vacate my own property after being forcibly lived by my uncle.

We had a family property which belongs to my grandfather late Dr. Gourhari Chatterjee. But when my grandfather was alive he had registered a single room on the ground floor to my father. The remaining 5 rooms has no any legal wearison. Still now the remaining 5 roms are belonging to my late grandfather. The single room which is registered to my father is still now forcibly occupied by my uncle. He had locked the room of us. Even my gtandfather had served them a legal notice but they didn't reacted to the notice. 1. So what legal procedure we should follow to get our room back & get the half of the remaining 5 rooms? 2. Do we have the right to get 50 percent of the remaining 5 rooms being not willed by my grandfather to both of his sons? 3. We have all the legal documents & property documents. So how long the case will run? 4. Having all clear documents, if we break the lock & occupy back our property, how much legal it will be? They are not giving us the key of our own property without making any scene. 5.If we filed a property suit or eviction suit or any case against him, does he have any right to begin any cinstruction on my property during the case ? or make a business on my property? 6. If I won the case, can I ask him for the rent for occupying my property? 7. We have some more property belonging to my father. Even there also they had occupied the are for last almost 3 years. We had tried a lot with good manner & words to get our property back but they didn't response.