The use of the Grandfather and Mr Carris' thoughts in the excerpt is to; emphasize grandfather's bravery compared to others.
The excerpt reads thus;
I didn’t run from the redcoats, and I won’t run from a dockside miasma. What is wrong with people, Andrew? We suffered all kinds of disease in our youth, but folks were sensible. They didn't squall like children and hide in the woods."
Mr. Carris cleared his throat.
"If the yellow fever were a soldier, you’d run it through with your famous sword and sit down to a hearty dinner. But there may be cause for caution, old friend. Listen to the mayor’s orders which Andrew has just printed."
On this note, it follows from Inferences drawn from the excerpt that the author's use of their thoughts is to emphasize grandfather’s bravery compared to others’.
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