Dear Mom and Dad, A week and two days ago the packers came to your house in Houston. All your piles of belongings, sorted for “air,” “sea,” or “storage” were boxed up and labeled. And tonight you will spend your third night in your new home in London. Your two-day stay with us was wonderful. I didn’t think about you leaving. I just enjoyed having you here. As I mentally prepared for your move, I keep thinking about my last sight of you as you left for Vietnam in 2003. I was seven months pregnant, wondering how you could leave me as my hour of need approached. But really I knew why. You went with your husband. You belonged to each other and I, for nearly three years at that point, belonged to another. And it was good. Of course, you could hardly stand not being there when Elisabeth was born. We called you on the phone somehow, and Dad, newly christened “Grandpère” jumped out of bed in his excitemen...