"Serious strength problem"?

I was skimming the Canada immigration website, and found that I was required to divulge whether or not anyone in my own flesh and blood has a history of "serious health problems". What exactly does the website mean by "family", and what exactly is "serious"? How do they find out whether or not anyone have a "serious" condition since many medical records are confidential?
Answers:   
Never ever list that.
It is the policy. They have ways of knowing if you are telling the truth or not on your application.

The information they are requesting concerns your immediate inherited. If they ask, you need to answer.


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