One Tuesday, I walked in to find Leo and David sitting on the floor, surrounded by old shoeboxes.

“What’s all this?” I asked, setting down my keys.

“We’re making a ‘Noise Box,'” Leo said. He looked tired—the dark circles under his eyes hadn’t vanished yet—but he wasn’t pulling away. He held up an old digital camera. “I found a video of Aunt Maya’s birthday. Dad and I are going to extract the audio so I can hear her laugh whenever I need to.”