My grandfather has a property, he died in 1986 and he has 5 children. One of the children is my dad,

My grandfather has a property, he died in 1986 and he has 5 children. One of the children is my dad, my dad died in 2011 and he has 2 children including me and a daughter. In the absence of any will, the grandfather's property is equally shared by all. I and my sister wish to transfer my rights in joint property to our mother. How can we do that? Such that if in later years the joint property be sold, my and my sister's share goes to our mother.