Illegal possesion

My dad are 3 brothers. Since my grandfather didnt wrote his will, the partion of ancestral property is still pending in court for around 14 years. The problem is that in one of the ancestral property, all the 3 brothers used to do business ie 1 in proprietorship and the other 2 in partnership. The partnership business was carried on in ground floor nd the other on the first floor as agreed. Due to some circumstances we had to close down or partnership business and our premises was left vacate. Around 8-10 months back when we tried to open the doors of our shop, it was locked from inside. Since the matter is pending in court, the police said that we cant interfere and no one will open that gate untill court decides the case. But recently 2 days back the brother who used to do business on first floor, illegally took the possession of our primises and started doing construction of ceiling and furniture and started his business from our premises. He has illegally overtook the possesion of the whole building. What actions we can take against him as we feel helpless as the cops are not helping us. Kindly guide