Property Daughters Share

my name is sudheer 50 yrs old i have one property issue..my mother have 5 children ..2 brothers 3 sisters including me..my father died when I was small..after my father died she divided property n gave to my sister's also..in my part old house came..so I developed my old house to in to shops n one house..now I am planning to sale my 2 shops now my sisters send legal notice that she want also share..if she file case she will get share? My mother gave me my property has gift dd in grampanchanyaty from 1992 i hav ownership certificate iam.nly payng taxes..its registered in gram panchayath .please advice me