Mitchel bumps his daughter’s head on the doorframe, and he and Cam worry that something may be wrong with their daughter. They consider causal outcomes, like if he had hit her head she would cry (which she does), but then they worry about long term impacts of hitting her head. The two decide to call Claire for guidance.
Claire reassures them that everything is fine because her youngest son (Luke) was hit on the head a lot and he’s fine. Unfortunately, this correlation ends up worrying Mitchell more. While it may not necessarily be causal, the two worry that is and decide to take Lily to the hospital.
See more: causation, correlation, health care
Economics of Modern Family 