Richard Yates 
Easter Parade [EPUB ebook] 

Even as little girls, Sarah and Emily are very different from each other. Emily looks up to her wiser and more stable older sister and is jealous of her relationship with their absent father, and later her seemingly golden marriage. The path she chooses for herself is less safe and conventional and her love affairs never really satisfy her. Although the bond between them endures, gradually the distance between the two women grows, until a tragic event throws their relationship into focus one last time.