Originally Posted by MumOfThree
... questions like that are aimed at ...
The point being that the government may check for consistency between data held by various agencies and the ACS responses for each particular family member.

Originally Posted by MumOfThree
... someone who physically can't push a trolley...

Use of the word trolley in this context is not typical "American" English, therefore I will ask whether you are in the US and have completed or may become subject to the American Community Survey (ACS) of the Census Bureau?