What will be the share of son mother and sister in fathers property

I have following query regarding our family property. My father was expired 2 years ago. My father has given nomination of his sole owned flat in the Name of my sister,( Not submitted nomination for last 2 Years), We are 4 legal hair as per law My mother, my self & 2 sisters , My father had died without making will. Both sister marriage year is 1981 that is before 1994( Maharashtra succession law). The query is : 1) What will be sons percentage share in property since there is no partition done till date. 2) What will be % share of my mother & 2 sisters in the property.