On the night when Grendel came back to his lair from his rampaging, Grendel's Mother was angered by his actions "what have you done Grendel?" she said to him. "Men? Grendel we had an agreement, Fish and Wolves and Bear, and sometimes a sheep or two. But not Men." Grendel asked his mother "You like men here." Then his mother told him not humans as they will come and kill them like the rest of their kind. Grendel explained that they were making noises and it hurts him, His mother then becomes empathetic for him and asks about Hrothgar, but he did not touch him and she becomes motherly and even said "Thats a good boy, my poor sensitive boy."This suggests that Hrothgar is Grendel's father.