Inheritance according to Muslim personal law.

My Brother expired before my father expired, leaving behind him his wife and one son. Property left behind my father was purely earned by my father, now my mother and my three younger sisters lives together. How and amongst whom should the property distributed? Can the deceased brother's wife ie; my brother's wife forcefully claim share in my fathers property according to Muslim personal law. Pleas note, we belong to Kerala and Sunni Muslim. Thank you.