I assume you are referring to the changes in the Red House in Book II, once Godfrey Cass has married Nancy Lammeter and sixteen years have passed. Of course, Book II details some of the series of changes that have occurred in the characters that we were introduced to in Book I of this fascinating novel, and Godfrey and Nancy are no exception in that their lives have changed greatly too. We are told that the Red House has changed greatly because of its new mistress, and Chapter 17 gives us a description of how in particular the parlour has been transformed:
A great change has come over the dark wainscoted parlour since we saw it in Godfrey's bachelor days, and under the wifeless reign of the old Squire. Now all is polish, on which no yesterday's dust is ever allowed to rest, from the yard's width of oaken boards round the carpet, to the old Squire's gun and whips and walking-sticks, ranged on the stag's antlers above the mantelpiece. All other signs of sporting and outdoor occupation Nancy has moved to another room; but she has brought into the Red House the habit of filial reverence, and preserves sacredly in a place of honour these relics of her husband's departed father... All is purity and order in this once dreary room, for, fifteen years ago, it was entered by a new presiding spirit.
Thus Nancy has clearly taken charge of the Red House, looking after it well and preserving the memory of Godfrey's father with "filial reverence."