David Sedaris wrote a touching article in The New Yorker about his first family vacation after his youngest sister committed suicide last spring. I’ve still only read one of his books, but the few columns I’ve read of his have convinced me that I need to read more. “Why do you think she did it?” I asked as we stepped back into the sunlight. For that’s all any of us were thinking, had been thinking since we got the news. Mustn’t Tiffany have hoped that whatever pills she’d taken wouldn’t be strong enough, and that her failed attempt would lead her back into our fold? How could anyone purposefully leave…