The central idea that the two cyclists might be related is introduced when they recognize their similarity while staring at each other. (18) "They stood thus staring at each other with a sudden dim sense of their own similarity, until the shorter of the two shook his head whimsically."
This passage indicates that the two cyclists share a visual resemblance, leading them to recognize a potential familial connection. The "dim sense of their own similarity" implies a visual likeness or resemblance between the two individuals. The fact that they stand staring at each other and acknowledge this resemblance suggests a moment of realization or confusion about their potential relationship.
The detail that introduces the central idea that the two cyclists might be related in Flora Annie Steel's A Sovereign Remedy is found in the exchange where they recognize the similarity between them. This moment occurs when they are staring at each other, as mentioned in the excerpt: "They stood thus staring at each other with a sudden dim sense of their own similarity, until the shorter of the two shook his head whimsically." The sense of confusion and the recognition of their similarity are indicative of a familial connection that becomes the focus of the narrative.