You shouldn't hide injuries from people.
Finnegan just got home from soccer practice during which he injured his knee, when his parents ask him how his day was.
Finnegan wants to respond to his parents.
Finnegan tells his parents about his day in detail, including the injury he sustained during soccer practice.
Finnegan tells his parents that he had a great and uneventful day, purposefully not mentioning his injury so that he doesn't worry them.
Finnegan gets some advice from his parents on how to treat the injury temporarily until he can be seen by his doctor.
Finnegan develops complications from his knee injury that require hospitalization.