Who is Agatha and Felix in Chapter 13 when the "Monster" was telling us about how he is watching over the family he is watching over?

Felix is the son of de Lacey, he is devoted to his family and his mistress, Safie. Though noble, he drives the creature from the family cottage with stones. He thereby symbolizes one of the basic flaws in the human character: the hatred of difference. Agatha istThe daughter of De Lacey, she is yet another example of selfless womanhood, caring for her brother and her father despite their poverty and her own sadness.The Monster feels pity for them and watches over them.