When my five-year-old, Eli, mentioned his “other dad,” I was shocked — until I realized he wasn’t pretending. My sister, Lily, was involved, and my world unraveled. I had to find out who this man was and why she kept him from me.

Lily had always been there for me, especially after Eli was born. She helped with everything — from late-night feedings to diaper changes — and was his weekend getaway. I thought it was a healthy bond. But when Eli mentioned his “other dad,” something in my gut twisted.Eli had never known his father. Trent and I had parted ways before I even knew I was pregnant. But now, there was someone else in Eli’s life, and I was scared.