What is the ruling on differentiating between the sons of the son and the sons of the daughter in inheritance?

The daughters' children have no right to the inheritance of their maternal grandfather, as they are neither from the Ahl al-Furood (legal sharers) nor 'Asabah (agnatic heirs). They differ from the sons' children, who are considered 'Asabah. What the questioner may have heard regarding their right might pertain to waqf (endowment) and not inheritance, as waqf on offspring includes the daughter's child.