Summary
This quote humorously suggests that the speaker feels foolish or unintelligent, implying that they come from a family where such traits are expected. Instead of researching their family history, the speaker asserts that they already know enough about themselves to confidently claim that they are a "sap" or a dimwit. It conveys a self-deprecating sentiment while highlighting the idea that the speaker perceives themselves as less intelligent compared to others in their family.