Property matter between brothers

Currently we stay in a chawl room in Chembur, years back around in 1995 my father bought 2 chawl rooms in thane and transferred the chawl rooms to my younger's brother name, that time we had a mutual understanding that the current chawl room in Chembur will belong to me and thane chawl rooms will be of my brother, now after long time in 2018 luckily our chawl room is undergoing redevelopment and the property prices have skyrocketed, now my brother is claiming his share in my chawl room. 1.We did not make any legal MOU during 1995 2.My father and mother both died early this year in 2018 3.The chawl room I stay is on my father's name and my brother is taking advantage of this thing. I, as good son, never forced my father and mother to transfer the property on my name, my brother too was acting good untill out parents passed away, he has become greedy now, and betraying me. 1.I have put this case under our community and I have a full support in my favour, there were many witnesses at the time of purchasing the thane room, as the rooms were purchased with the retirement money of my father. 2.my parents too wanted to transfer the property on my name after they were gone 3.i have 3 sisters which too are in my favour. Well it's a big mistake, I did't make any legal deed and now I have been threatened to give 50% share to my brother, which is totally unfair and evil. I can't even claim the thane chawl room as he played smart and cunningly transferred the properties in his name. What are my rights, how to go about from here on, pls guide.