Can my brother sell joint property without other brothers permission

My Brother built a house in Lavkush Nagar, Bhopal around 1996. At that time I was living in other city. In 2002 i along with my parents shifted to Bhopal and My brother only advised me to built 3 more rooms on the terrace of the house. I did the same and started living there without any legal formality. In 2010 my brother asked me to do the separate registry of the upper portion and it was done in my name. So the upper portion including the terrace is now registered in my name. With time and mis-communications he developed several prejudices, hatred and all of a sudden he stopped communicating with me. Recently i heard that he has purchased yet another house in some other area and soon shifting to his new house. Though i am not sure but i heard from my relatives that he has mortgaged the present house and availed loan against it. My problem is HOW SAFE IS MY PORTION and can he sell the house without my knowledge? Kindly advise me, as he stopped all the communications with me.