The irony lies in the fact that, despite sharing the same DNA and upbringing, the twins' lives diverge so drastically. One would expect twins, especially identical ones, to share similar traits and follow somewhat parallel paths. However, the story subverts this expectation, highlighting the complexity and unpredictability of human nature and individual experiences.
Through this ironic contrast between the twins, the author explores themes of free will, personal choices, and the role of chance and circumstance in shaping one's life. The story challenges the notion that our genes and upbringing entirely determine our destiny and emphasizes the unique choices and experiences that mold each individual's journey.