I DNA tested my granddaughters because something deep in my blood screamed that my son wasn’t their father. I thought I was going to unmask my daughter-in-law, but the result ended up pointing to someone much closer. The envelope arrived on a Tuesday, while I was warming tortillas on the griddle. My son, Matthew, was smiling at me from a photo on the wall. And when I read the first line, I felt my entire house coming down on me.

The final blow came on a Friday. Roger showed up at the school. He said he was there to pick up Chloe. The teacher didn’t hand her over because Matthew had already left written instructions. But Chloe saw him from the playground and ran to the fence. “Secret daddy!”