When Sela Lowe invited her children, Aimee, Bobby, Cecelia, and Matty, to the lake at the beginning of September it was clear the invitation was more demand than request. At least, it was clear to Cecelia. The others viewed Sela’s words as law, as compact phosphorescent orbs of fact, the sort of facts told by honest-to-god truth tellers. “Righteous truths,” Matty once said to Cecelia. Whether demand or fact, Kyle kissed his wife outside the…