Who Can Claim My Unmarried Step Brother's Property?

We belong to Hindu family. My mother had a second marriage after the death of my first father. My mother expired in 2018. My step father(my mother's second husband who also had his second marriage after the death of his first wife) expired in 2021. My step brother(his own biological mother was the first wife of my step father) expired in 2022. My step brother had no other brother or sister except myself and was unmarried. My step brother's paternal grand mother who expired in 2012 gifted her property in 2011 to my step brother who made a joint venture with a property builder with that gifted property and got 2 flats on his name. There is no will made by my step brother. Only one aunt(sister of his biological mother) and one cousin brother of my step father(my step brother's uncle) are still alive of my step brother. Now as my mother,my father(2nd husband) & my unmarried step brother expired so can I claim those 2 flats myself or his aunt or uncle can claim the property?