The monster eavesdrops on the family all the time. Now that he understands what they’re saying, he puts together their story, which in many ways is like what has happened to Victor’s family.
Safie’s Turkish father was accused wrongly of a crime, much like Justine, and sentenced to death. Safie wanted to marry a European man because Turkish men treat women too much like property, a supposed product of them being Muslim, and her Christian mother taught her that that was a raw deal. Luckily, she met Felix when he was visiting her father in prison, and they fell in love.
Agatha, Felix, and the blind old man (named De Lacey) were at one time respected and rich Parisians. Felix plotted to help Safie’s father escape from prison, but he was discovered, and the family was exiled sans all their money.
Safie’s father tried to force her to move to Constantinople, but she escaped to Felix.
These stories give the monster hope that Felix and De Lacey will be compassionate towards him, since they too have suffered injustice. Not only is the monster kind, but he seems to have quite a sophisticated understanding of the human psyche.