Gaurav From Kolkata want legal help in Property / Ancestral Property / Will

My mother had a second marriage. My mother expired in 2018.My father(my mother’s second husband) expired in 2021.My step brother expired in 2022.My step brother had no other brother or sister except myself. My step brother’s grand mother who expired in 2012 gifted her property in 2011 to my step brother who had made a joint venture with a property builder with that gifted property and got 2 flats.
Now as my mother,my father(2nd husband) & my unmarried step brother expired so can I claim those 2 flats which is in my step brother’s name?