Family has always been important to me, so when my husband and my sister, Emily, seemed to get along so well, I felt fortunate. They were close, and I never questioned their relationship. But during a family gathering, I noticed the stolen glances and subtle touches that should never have been exchanged between a sister and a brother-in-law. My suspicions grew, and one day I confronted Emily. After a long silence, she broke down and admitted the truth—she and my husband had been having an affair for months. The double betrayal by the two people I loved most left me devastated.