By Mark A. Taylor Last year, just before my daughter”s wedding, a friend e-mailed me about the big day. “My daughter”s wedding was the most exhilarating and exhausting day of my life,” he said, and soon I would know what he meant. But it occurs to me that exhilarating and exhausting describe the whole gamut of married and family life. For example, it”s exhilarating finally to hold a newborn baby, especially after an exhausting labor and drawn-out pregnancy. Likewise, each milestone of the new preschooler”s life is exhilarating: first words, first steps, first everything! And keeping up with her is