WHat is Twain's satiric purpose in writing the long passage describing the Grangerford house?

The Grangerford home is much more affluent than Huck had ever seen. It is large and beautiful. The family owns a considerable amount of land and over one hundred slaves, including a slave for each member of the household. Huck's past with Pap was poverty stricken and even with Aunt Polly was humble.

Twain overdoes the house, pushing the boundaries of Southern aristocracy to point out that most of it points to a romanticism that is long past and soundly defeated by the Civil War. This family holds onto the relics from a time that is over.