Can we claim share in property gifted to brother

After death of my father my mother gifted the flat to my brother (we are two sisters and one brother). My brother died recently. Now my brother's wife and her son have shifted from banglore and taken over the property. We two daughters stay in Mumbai. They don't want our entry in the flat and want to sell the flat. Please advice as to how we can get our due share in the property owned by my late father. Thanks.