The Dutch House by Ann Patchett

Danny Conroy grows up in the Dutch House, a lavish folly in small-town Pennsylvania taken on by his property developer father. Though his father is distant and his mother is absent, Danny has his beloved sister Maeve: Maeve, with her wall of black hair, her delicacy, her brilliance. Life is comfortable and coherent, played out under the watchful eyes of the house's former owners in the frames of their oil paintings, or under the cover of the draperies around the window seat in Maeve's room. Then one day their father brings Andrea home: Andrea, small and neat, a dark hat no bigger than a saucer pinned over a twist of her fair hair. Though they cannot know it, Andrea's advent to the Dutch House sows the seed of the defining loss of Danny and Maeve's lives.