property distribution of self aquired property

5 years ago

living in Andhra pradesh now Telangana Since 1958
My father hindu aged 74 died in year 2006 leaving my mother aged 65 widowed. Myself,only son aged 43 married with 3 children, two unmarried girls aged 15,11 respectively and a boy aged 9 (all at the time of my fathers death in 2006) besides my four married sisters, all of them married before May 1996. we have no ancestral properties my father retired from service in the year 1992 and acquired 4 plots of vacant land and house property in which we've been living till date. I'm employed in govt. service from the year 1986 and living with my father and mother. I constructed a house in one of the plots(in 1998) owned by my father with my own funds.
My salary and income from this property were all utilized for family maintenance right from my emplyment date and also after my fathers demise in 2006 and my sisters are claiming one sixth share of all the properties including my building
Q1. How the properties of my father will have to be shared between my sisters and myself and mother.
Q2 Are all the grandchild legal heirs along with son and daughters of my father