Partition property of my father, he written will to his grand son of his son

We hindu family from Tamilnadu, My late grandmother (Her self acquired property) had own home , in 1981, during family partition among her two sons, my father got my grandmother home, my father died February 2005, before he died he written registered will to his grandson\\\'s sons and daughters (After 2 generation) means my father grandson is guardian only, my brother died 2012, since I m daughter of my father, he given only small house of his self acquired home via will, likely my father gave his another self obtained home to his grandson. now i m claiming my property share in my grandma home with 2005 womens property rights act & 1989 tamilnadu daughters property right act. In the will, my father written that my mother can live in that house till her life, no other rights given to my mother. I look after my mother surgery & medical expenditure, my mother now ready to give her share through dhanagraiya settlement, if i m getting that is that valid?  If i shoot petition against my father grandson how the share would be divided ?what would be my share? My father not absolute owner of that property, even if he lives the share would be divided 1/3 among my self , my father and my brother. After my father and my brother died , now myself , my mother and my brother wife and her son age 19 years are legal heirs, i m married in 1995 have 2 son ( 14 years) and daughter (21 years). Kindly give details of my property rights In another description My wife claimed her grandfather and grandmother property had been partitioned between my father and his co brother. Issue on My grandmother (property) home 1708 sq.ft A partition took place between my father and his brother in 1981, during partition my father obtained my grandmother above said home and his co brother got grandfather's house, before my father died in February 2005 he written registered will to his grand son's son means grand son is guardian of his heirs. My father is not absolute owner of that property. I m claiming the home is my grandfather property, after my grandfather died in 1999. The home to be divided into 1/3 ratio among myself, my father and my brother, and only my father can give his part to his grand son. Meanwhile my father died in February 2005, my brother died 2012, so property will be further divided in to my mother and my brother Wife and her son as per Will or legally I m seeking your legal opinion on partition of this property. My mother wants to give her part to me, she ready to give Dhanagraiya settlement of her part since I only lookafter her. My question is can myself and my mother write property to my daughter and my son? Or can I get my mother part via Dhanagraiya settlement?