I opened the door anyway. The woman lowered her phone, and for a long moment we only stared at each other, because it was like looking into a mirror that had aged in a different house. “I’m Vivian,” she said, her voice cracking. “I think I’m your sister.” Behind me, my mother let out a broken cry and sank into a kitchen chair. I led Vivian inside, and my mother reached for her hands, saying a name I had never heard, Clara, over and over.

Then my mother told us everything. Fifty-six years ago, she was a young widow with newborn twin girls and no money. Her husband had died only weeks earlier, so she cut four small blankets from his black funeral coat and stitched a silver star into each one, two for every baby. A wealthy, childless woman she cleaned offices for offered to adopt one girl and help support the other. Terrified that the winter would take both babies, my mother agreed. She named the daughter she gave away Clara, and the woman promised that if twins were ever born in the family again, Clara’s blankets would be sent back, so the sisters could finally meet.

Vivian wiped her eyes and said she had grown up loved but never knew the truth, until her adoptive mother died last spring and left a letter with the blankets. When she saw my daughter’s announcement online about the twins, she knew the promise was ready to be kept. She had been too frightened to knock, so she sent the blankets first, then sat in her car for an hour listening to the ticking of the dashboard clock.

My mother admitted she had begged me to keep the blankets from the hospital because she was ashamed, and afraid the secret would overshadow Hannah’s joy. But shame had cost her a daughter once. That evening, the three of us walked into Hannah’s room together. She cried and wrapped each baby in a black blanket with a silver star, and when Vivian held a niece, our family was finally complete.