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William and Annie had a daughter, Marion duPont, and a son William du Pont, Jr. Upon William du Pont, Sr.'s death in 1928, William du Pont, Jr. inherited the family's Bellevue estate in Delaware, whereupon he had the estate's mansion converted into a replica of Montpelier (now preserved as a state park),^[14] and Marion inherited the Montpelier estate. Marion preserved much of the core of the Madison home, gardens, and grounds as a legacy for all Americans. After her father's death, Marion made only one change to the house; she remodeled her parents' music room in the latest Art Deco style, using modern and innovative materials such as laminated plywood, chrome, glass block, and plate glass mirrors. A weather vane was installed on the ceiling, which allowed wind direction to direct the hounds for fox hunting. An exact replica of the Art Deco room can be seen in the DuPont Gallery, in the Visitors' Center at Montpelier. Prior to her parents moving into the property, they enlarged the house considerably, adding wings that more than doubled the number of rooms to 55. Her parents also had the brick covered with a stucco exterior for a lighter look.