Situation irony
There is a situation irony when Mia and her siblings realize that their father has been conducting scientific experiments on them to quantify happiness. Mia, her siblings, and her mother have always loved Adam unconditionally. Ironically, Adam doubts the love and happiness in his family, which compels him to develop a theory called happiness quotient (HQ) to gauge his family's love and happiness. Mia feels that her father's decision to use his family as an experiment is an act of betrayal.
Verbal irony
The verbal irony in the novel occurs when Mia says that her brother, Eugene, cannot comprehend his surroundings. Ironically, Mia knows that Eugene can perceive everything, and the only thing he does not do is talk. In other words, Eugene can listen, hear, and communicate using signs. Consequently, Eugene can perceive his surroundings quickly without any problem.
Dramatic irony
The main dramatic irony is that readers know that Adam left his home to live with Anjeli, a woman who spends most of his time taking Eugene through therapies. Other characters in the novel believe that Adam's disappearance is mysterious. Investigators treat treats Adam's disappearance as a serious crime.
