Last weekend, Candace, Will and I visited my mother. And, while I was there, I realized I was very tired. Granted, I had not slept well the night before, but it suddenly occurred to me that I am often tired when I visit my mother. Then, on the way home, it also occurred to me that I often feel tired when Candace and I visit her father or mother. I brought this up to Candace. I asked her if she thought I had some kind of problem. “Have I developed a mental association with our parents…some self-imposed Pavlovian condition…is it…