At 2:27 a.m., my mother called from a police-station bathroom and whispered, “Honey, Dana hurt me during an argument, and your brother did nothing. Now they’re claiming I’m mentally unstable and blaming me for everything.”

While the paramedics examined Mom, Captain Ross attempted to speak with me privately.

“Let’s resolve this quietly,” he said. “Dana became frightened. Your mother may have misunderstood what happened.”

“My mother taught mathematics for thirty-eight years,” I replied. “She still completes the Sunday crossword in ink.”