What was comical about the family in "A Good Man is Hard to Find," and what qualities were meant to be taken seriously?

This in many ways is an odd story. Some of the
descriptions, especially of the family, are downright hilarious, whereas obviously the
story contains moments of absolute horror when they meet "The Misfit" at the end.
Consider the initial description of Bailey's wife:

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...a young woman in slacks, whose face was as
broad and innocent as a cabbage and was tied around with a green headkerchief that had
two points on the top like rabbit's
ears.

Clearly this
description gives us a good idea of the woman's mental capabilities whilst also being
very funny as we are made to compare her with a cabbage and also a
rabbit.

However, apart from these moments of humour, I
think what is meant to be taken seriously is the way that this family annoy and get at
each other. There is something very realistic about the way that the Grandmother tries
to manipulate her son to get her way and the fighting between the children. This family,
for all of the descriptions, is a family that we can all relate
to.