My father inherits a property worth Rs. 10 crores from my grandfather. My grandfather had distributed his property to his five children through a registered partition deed in the year of 1976 itself and my father got his share. We are two legal heirs to my father – myself (daughter) and my brother. My father is 85 years old and is not capable of understanding or taking decisions. My brother keeps my parents under his clutches and doesn’t permit me to reach them. Recently, my brother has taken my father to the registrar’s office and got the title of my father’s property transfered to his name. My question is whether this documentation is valid without my signature. If so, is there any time limit for raising my objection and initiating legal action?