Do the grandchildren inherit from their grandfather in Islamic Sharia, and what is the proof for that?

Sons of the son inherit from their grandfather if he has no living son. However, if the grandfather has a living son, the sons of the son do not inherit, and this is a consensus among scholars. In this case, it is recommended to make a will for the sons of the son, provided it does not exceed one-third of the inheritance, especially if they are in need. One must believe that what Allah has decreed is wisdom, justice, and mercy.