The grandfather registered the land in the name of each family member and said that the land belongs to the person in whose name it is registered. So if he gave the land in complete possession of the person in whose name it was registered and made him/her its owner then each one became the owner of the land that was in his or her name. And the land of father became inheritance after his death. Now each heir is entitled to get his share as per the Shariah. And if the grandfather did not make them the owner and did not give the registered land in their possession then only by paper work one does not become the owner. In this case, all the land remained in the possession of the grandfather. It shall be divided among his legal heirs after his death. Whatever the father will get it shall become his inheritance after his death and it shall be divided among his (father’s) Shariah heirs.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband