Andrew came running and begged me to come inside. In the living room, the woman introduced herself as Brooke, Andrew’s younger sister, whom I had never met. They had been estranged since he was nineteen, after a bitter family split, and I only knew that he had no siblings, because he had told me so. He had found her two years earlier, learned she had a daughter, Tilly, and had been quietly helping her.

Brooke explained that she had been very sick and had nearly lost her home, and she begged Andrew not to tell anyone until she was well. He had kept the secret because he was ashamed of how he had treated her, and he did not know how to explain a lifetime of lies to me. The “business trips” were weekends spent fixing her roof, driving her to treatments, and learning to be an uncle.

I was angry, and I told him so. A secret kept for love is still a secret, and it had nearly cost him his marriage. But Tilly climbed into my lap and handed me a crayon drawing of our two families, and I could not stay hard. Andrew apologized, truly, with tears running down his face, and promised never to hide anything from me again.

Brooke recovered over the next year, and we spend every holiday together now. Leo and Tilly are inseparable, and Andrew’s trips are only ever business. My son, it turns out, kept the secret for a year, and I never again told him that children say strange things. I listen the first time.