Dispute of Properties

Respect sir, My name is sunil and I stay in Thane Maharashtra. We are all 7 brother & sister all are married but after my father & mother death start dispute in family against for my properties. I am the youngest son of My father & he is nominated to me for his flat after death flat will be transfer on my name.. Now, all my brother & sister is demanded to me that equally divided on these properties. I have no will against my flat but I have nomination form which is registered at society office at the time of possession.. My father is already registered nomination on my name when he was buy these property.. I know it will be equally divided in my brother & sister but they all are never take care to my father & mother regarding for health issues. Now, they all are demanded against these properties otherwise they will case file against me. Please help me how can I save my properties because all are well settled and all are have own flats in Thane.. I am very disappointment for miss-behavior of my brother & sister suddenly..