How does Poe make the family and the house appear as one in The Fall of the House of Usher?

Poe uses descriptive language to merge the physical features of the Usher family members with the decaying house. By emphasizing their shared characteristics and mannerisms, Poe creates a sense of entwined fates and a blurred line between the human characters and the house itself. This technique enhances the theme of interdependence and inevitable decline.