Can we make statement of grandfathers property through his will

My grand father got some property from his grandfather i.e. ancestral property and earned some on his own. Now can he make some statement according to his will while he is alive for partition? He has three sons and one of them died around 2 years back. Now as some of his self earned property is registered on the name of one of his son, who died. Now his wife is saying to forget all the property with the name of the son, who died and wants to divide the rest of the property. Now my grandfather wants to equally divide his total(ancestral and self earned) property to all. Can he make some statement or what is the way to achieve this? My religion is Hindu.