The ordinary pleasures of raising children are not often talked about, because they are unspectacular and leave no lasting trace, but they sustained me for years as our boys grew and flourished, and they continue to sustain me now. I can’t help but take pleasure in the fact that my children are thriving as I decline. It seems only fitting, a sure sign that my job in the world is done. It’s like the day Dan, then in the fourth grade, turned to me twenty yards from the school gate and said, “You can go now, Mum.” I knew then that the days of our companionable walks were over, and that as time went by there would be further signs of my superfluity, just as poignant and necessary as this one.