The weeks between Mother’s Day and Father’s Day are also the time for high-school and college graduations, which often involve visits from grandparents. That makes this a time for generations to get together so they don’t make the mistake I made. Here’s my error: From the time I turned an arrogant 13, my father and I didn’t talk much. Looking back now, it seems unbelievable that when I flew from Texas to Massachusetts in 1984 to visit my parents for a week as he was dying of cancer, we didn’t talk for more than minutes about anything important, and I...