land problem

My grandfather is not willing to give his property(land) to my father due to some situations. But he is giving his property to another son. Is there any change to stop that registration. In case his property given to another son is there any law to return from that person. Without intimation to my father is that given to that person is that valid or not . ...If that property has not been inherited by your grandfather in undivided manner through four male lineage,then it becomes his self acquired property and then your grandfather can give it to anybody else of his choice and no intimation to your father is necessary

both sons are necessary to available before the registration that land for registration.... If that property has been inherited by your grandfather in undivided manner through four male lineage,then it becomes his ancestral property and then he can't deprive your father.