Statutory leaves are compulsory as per the Act under which your establishment is covered. If your Establishment is covered under Shops and Establishment Act then please refer Maharashtra Shops and Establishment Act and follow leave rules as stipulated over there.
with regard to National /Festival Holidays it is 4 National Holidays and 5 Festival Holidays to be given to employees. Festival holidays as per important festivals of your jurisdiction.
With regard to leave for immediate family member death, it is employer specific either separate leave may be considered or to be adjusted from accrued leave account of employees.