Why does La Rapet want to see Honore Bontemps mother?

La Rapet wants to see Honoré Bontemps' mother to gain insight into Bontemps' background and possibly to understand the motivations behind his actions. She believes that by connecting with his family, she can uncover deeper truths about him and potentially influence his decisions. This desire reflects her keen interest in personal relationships and the impact of familial ties on an individual's behavior.