Nancy, my mother-in-law, arrived at exactly 7:30 a.m., just like every workday since I returned to the office. She had been a nurse for over thirty years before retiring, and when she offered to watch Sophie instead of us hiring a nanny, I felt relieved and grateful. She always greeted us with warmth, her silver hair perfectly pinned back, her hands steady and experienced as she took Sophie and checked her temperature with the back of her fingers.